Name: arm muscles and their movements
Uploaded: 2024-03-28T14:28:28.000Z
Duration: 1 min 31 s
Channel: JoVE

K12 Standards

Florida Department of Education

High School

Life Science

SC.912.L.14

SC.912.L.14.20

Muscles that Move the Arm

Arm muscles are categorized into axial and scapular muscles.
The two axial muscles are the pectoralis major and latissimus dorsi.
The pectoralis major has clavicular and sternocostal heads for arm flexion and extension, respectively. The latissimus dorsi extends the arm. Both the pectoralis major and latissimus dorsi adduct the arm and rotate it medially.
There are seven scapular muscles.&#160;
The teres major and the latissimus dorsi cause arm extension, adduction, and medial rotation.
The deltoid muscles cover and shape the shoulder, enabling arm abduction, flexion, extension, and medial and lateral rotation.
The supraspinatus on the superior scapular region assists the deltoid in arm abduction.
The infraspinatus on the posterior scapula causes lateral arm rotation.
&#160;The teres minor causes extension and lateral arm rotation along with infraspinatus.
The subscapularis, located at the anterior surface of the scapula, causes medial arm rotation.
The supraspinatus, infraspinatus, teres minor, and subscapularis, along with their corresponding tendons, combine to create the rotator cuff.
The coracobrachialis, an elongated arm muscle, helps with arm flexion and adduction.

muscles that move the arm

Nine muscles are involved in arm movements. Two of these, the pectoralis major and latissimus dorsi, originate from the axial skeleton and are called axial muscles. The other seven originate from the scapula and are called the scapular muscles.
The pectoralis major has two origins. Its clavicular head originates on the medial half of the clavicle. In contrast, the sternocostal head originates on the costal cartilages of ribs 1-6, the sternum, and the aponeurosis of the external oblique of the anterior abdominal wall. Both these heads merge and insert on the intertubercular sulcus of the humerus. Its clavicular head flexes the humerus, and the sternocostal head extends a flexed arm back to the anatomical position. When the head works together, they adduct and medially rotate the humerus.
The latissimus dorsi originates from the spinous processes of the thoracic vertebrae T7 to T12, crests of sacrum and ilium, and ribs 9 to 12. It inserts anteriorly on the intertubercular sulcus of the humerus. Acting with the scapular muscle, teres major, it extends, adducts, and medially rotates the humerus. The origin of the scapular muscle, teres major, is at the inferior angle of the scapula. It inserts into the humerus at the medial lip of its intertubercular sulcus. Its actions are the same as that of latissimus dorsi.
The scapular deltoid is the most superficial muscle of the shoulder joint and is responsible for its rounded shape. Its anterior fibers originate on the lateral of the clavicle &#8212; the lateral fibers originate from the acromion of the scapula, and the posterior fibers originate from the spine of the scapula. All the heads merge and insert on the deltoid tuberosity of the humerus. While the lateral fibers abduct the arm, the anterior fibers flex and medially rotate it, and the posterior fibers extend and laterally rotate it.
The scapular muscles &#8212; supraspinatus, infraspinatus, teres minor, subscapularis, and their corresponding tendons, combine to create the rotator cuff. The origin of the supraspinatus muscle lies on the supraspinous fossa of the scapula. Conversely, the infraspinatus muscle originates from its infraspinous fossa. Both these muscles are inserted at the greater tubercle of the humerus, aiding in arm abduction and lateral rotation, respectively.
Another muscle, the teres minor, also inserts at the greater tubercle of the humerus but originates from the inferior angle of the scapula. It acts along with the infraspinatus muscle to laterally rotate and extend the arm. The origin of the subscapularis muscle is at the subscapular fossa of the scapula. It inserts on the lesser tubercle of the humerus and aids in the medial rotation of the arm. Finally, the last scapular muscle involved in arm movements is the coracobrachialis. The origin of this muscle is at the coracoid process of the scapula, and the insertion is on the middle surface of the medial shaft of the humerus. It helps with arm flexion and adduction.
The rotator cuff muscles are prone to injuries, especially in people active in sports. Due to its positioning between the head of the humerus and the acromion of the scapula, the supraspinatus muscle is particularly prone to strain and degenerative changes.

Arm muscles are categorized into axial and scapular muscles.
The two axial muscles are the pectoralis major and latissimus dorsi.
The pectoralis major has ...

Education

JoVE Core

Anatomy and Physiology

Unit 1

The Muscular System

KEY TERMS AND CONCEPTS

arm muscles and their movements

Arm muscles move the humerus through flexion, extension, abduction, adduction, and rotation. Nine muscles help produce these arm movements. Two of them, the pectoralis major and latissimus dorsi, come from the axial skeleton. The other seven begin on the scapula and are called scapular muscles.

The pectoralis major has two origins, or heads. Its clavicular head starts on the medial half of the clavicle. Its sternocostal head starts on the costal cartilages of ribs 1 through 6, the sternum, and the aponeurosis of the external oblique of the anterior abdominal wall. Both heads join and insert on the intertubercular sulcus of the humerus. The clavicular head flexes the humerus. The sternocostal head brings a flexed arm back to anatomical position. Working together, the heads adduct and medially rotate the humerus.

The latissimus dorsi starts on the spinous processes of thoracic vertebrae T7 to T12, the crests of the sacrum and ilium, and ribs 9 to 12. It inserts on the front of the intertubercular sulcus of the humerus. The teres major works with it. Teres major begins at the inferior angle of the scapula and inserts on the medial lip of the intertubercular sulcus. These two muscles extend, adduct, and medially rotate the humerus.

The deltoid is the most superficial muscle of the shoulder joint, and it gives the shoulder its rounded shape. Its anterior fibers begin on the lateral part of the clavicle. Its lateral fibers begin on the acromion of the scapula, and its posterior fibers begin on the spine of the scapula. All three parts merge and insert on the deltoid tuberosity of the humerus. The lateral fibers abduct the arm. The anterior fibers flex and medially rotate it. The posterior fibers extend and laterally rotate it.

The scapular muscles also include the rotator cuff. The rotator cuff is made of the supraspinatus, infraspinatus, teres minor, subscapularis, and their tendons. Supraspinatus starts in the supraspinous fossa of the scapula and inserts on the greater tubercle of the humerus. It helps with arm abduction. Infraspinatus starts in the infraspinous fossa and also inserts on the greater tubercle. It helps with lateral rotation. Teres minor starts at the inferior angle of the scapula and inserts on the greater tubercle. It laterally rotates and extends the arm. Subscapularis starts in the subscapular fossa, inserts on the lesser tubercle of the humerus, and helps medially rotate the arm.

The last scapular muscle involved in arm movement is the coracobrachialis. It starts at the coracoid process of the scapula and inserts on the middle surface of the medial shaft of the humerus. It helps flex and adduct the arm. The rotator cuff muscles are often injured, especially in people who play sports. The supraspinatus is especially vulnerable because it sits between the head of the humerus and the acromion of the scapula, where strain and degenerative change can occur.

Arm Muscles and Their Movements

the muscular system

Muscles, Bones, and Body Movement

The muscular system helps the body move, stay stable, and carry out internal work. It includes three kinds of muscle tissue: skeletal, smooth, and cardiac muscle. Each type has a different role in the body. Skeletal muscles are under conscious control, so people can move them on purpose. They attach to bones by tendons, and their contraction and relaxation make actions like walking and lifting possible. These muscles also produce heat during physical activity, which helps maintain body...

fascicle arrangement in skeletal muscles

How Muscle Fiber Layout Shapes Movement

Skeletal muscle fascicles are bundles of muscle fibers, and their layout helps determine how a muscle moves. The way these fascicles are arranged affects both power and range of motion. Different arrangements give muscles different mechanical strengths. Parallel muscles have fascicles that run parallel to the long axis of the muscle. Common examples are the biceps brachii and the rectus abdominis. When these muscles contract, they shorten and become wider. They can shorten by about 30% of...

muscle coordination and action

Muscles That Work Together in Movement

Muscles work together to create smooth, purposeful movement. Actions such as flexion, extension, adduction, abduction, and rotation depend on this coordination. The body uses several muscles in a controlled way so joints and bones move as needed. Four functional roles help describe how muscles act during movement: agonist, antagonist, synergist, and fixator. An agonist, also called the prime mover, is the main muscle that produces a specific motion. During a bicep curl, the biceps brachii is...

naming skeletal muscles

How Muscles Get Their Names

Skeletal muscle names are built from features that help identify each muscle. The names of the roughly 700 muscles in the human body can point to where a muscle is found, what it looks like, or how it works. That makes the names easier to learn and remember. Many muscle names describe the region of the body. The temporalis muscle is in the head region, while the brachialis is in the arm. Other names describe position and depth. Muscles near the surface may be called externus or superficialis,...

axial and appendicular muscles

Muscles for Movement and Body Support

Skeletal muscles support movement and body structure. They are grouped into axial muscles and appendicular muscles based on where they are found and what they do. Axial muscles lie along the body’s midline. They connect with the axial skeleton, which includes the skull, spine, ribs, and sternum. These muscles help with facial expressions, head and neck movement, speaking, and eating. They also help control movement of the vertebral column with the back muscles. The trunk also contains...

muscles for facial expressions

How Facial Muscles Shape Expression

Facial muscles shape human expression by moving the skin of the face and scalp. These craniofacial muscles are thin skeletal muscles that lie just beneath the skin. They help create the nonverbal signals people use to show emotion and intention. There are about 20 of these muscles. Most begin on bones or fibrous parts of the skull and then extend outward to attach to the skin. They are called muscles of facial expression, or mimetic muscles, because they reflect feelings through movement. <br...

muscles of the eye

Eye Muscles and How They Focus

The eye muscles control movement, focus, and eyelid opening. The human eye uses ten muscles: six extraocular muscles, three intraocular muscles, and one main eyelid retractor muscle. The six extraocular muscles sit around the eyeball and move it in different directions. The lateral rectus pulls the eye outward, and the medial rectus turns it inward toward the nose. The superior rectus and inferior rectus move the eye up and down, while the superior oblique and inferior oblique rotate the eye.

muscles of the anterior neck

Anterior Neck Muscles by Region

The anterior neck muscles are grouped by where they sit in the front of the neck. They include superficial muscles, suprahyoid muscles, and infrahyoid muscles. This layout helps show how the neck muscles are organized around the hyoid bone. The superficial muscles are the most visible muscles in the front of the neck. They include the platysma and sternocleidomastoid, often called the SCM. The platysma is a broad, thin muscle that stretches from the chest and shoulders to the lower jaw and...

muscles that move the head

How Neck Muscles Guide Head Motion

Neck muscles guide head motion by working together to bend, turn, and lift the head. They help with rotation, flexion, extension, and lateral bending. The sternocleidomastoid, or SCM, plus the suprahyoid and infrahyoid muscles are major head flexors. The SCM runs from the sternum and clavicle to the mastoid process of the temporal bone. When both SCM muscles contract, they bend the head forward. When only one side contracts, it bends the head toward that side or turns the head to the opposite...

muscles of the vertebral column

How Back Muscles Support Spine Movement

Back muscles that lie deep to the thoracolumbar fascia are called intrinsic, or true, back muscles. They are grouped into four layers. These layers are the superficial, intermediate, deep, and deepest layers. The superficial layer mainly includes the splenius muscles. These are the splenius capitis and splenius cervicis. They help move the head and cervical spine by supporting extension, rotation, and lateral bending. The splenius capitis runs from the upper thoracic and lower cervical...

muscles of the thorax

How Thorax Muscles Drive Breathing

Thorax muscles help breathing and support movement in the upper body. They also help keep the chest stable. Together, these muscles make the rib cage move while the lungs fill and empty. The diaphragm is the main breathing muscle in the thorax. It is a wide, dome-shaped muscle that separates the thoracic cavity from the abdominal cavity. It starts below the rib cage and lumbar vertebrae and attaches to the central tendon. When it contracts, it flattens and moves downward. This increases the...

muscles of the abdomen

Abdominal Wall Muscles and Support

The abdominal wall muscles support the abdominal cavity and help protect the internal organs. This flexible wall is bordered by the xiphoid process and costal margins at the top, the vertebral column at the back, and the pelvic bones and inguinal ligament at the bottom. It is divided into the anterolateral region and the posterior region. The anterolateral region includes five paired muscles in two groups. The lateral group contains the external oblique, internal oblique, and transversus...

muscles of the pelvic floor and perineum

Pelvic Floor Muscles and Continence

The pelvic floor and perineal muscles support the pelvic organs and help control continence. They also play roles in sexual function, childbirth, and core stability. These muscles are usually divided into a superficial perineal layer and a deeper pelvic floor layer. The perineum is a diamond-shaped area below the pelvic diaphragm. It is split into an anterior urogenital triangle and a posterior anal triangle. The urogenital triangle contains the external genitals and includes the superficial...

muscles of the shoulder

Shoulder Girdle Muscles and Scapula Motion

Shoulder girdle muscles stabilize the clavicle and scapula, and that support helps the humerus move efficiently. Scapular movement also works with humerus movement and extends the arm’s range of motion. Raising the arm overhead depends on upward rotation of the scapula. The anterior thoracic muscles include the serratus anterior, subclavius, and pectoralis minor. The serratus anterior, often called the boxer’s muscle, starts on the first to eighth or ninth ribs and inserts along the superior...

Arm muscles move the humerus through flexion, extension, abduction, adduction, and rotation. Nine muscles help produce these arm movements. Two of them, the pectoralis major and latissimus dorsi, come from the axial skeleton. The other seven begin on the scapula and are called scapular muscles. The pectoralis major has two origins, or heads. Its clavicular head starts on the medial half of the clavicle. Its sternocostal head starts on the costal cartilages of ribs 1 through 6, the sternum, and...

muscles that move the forearm

Forearm Muscles for Elbow and Rotation

Forearm muscles help the arm bend, straighten, and rotate at the elbow and radioulnar joints. They are grouped as forearm flexors, forearm extensors, forearm pronators, and forearm supinators. The flexors and extensors act on the elbow joint. The pronators and supinators act on the radioulnar joints. The forearm flexors are the biceps brachii, brachialis, and brachioradialis. The biceps brachii has two heads. Its long head begins at the supraglenoid tubercle of the scapula, and its short head...

muscles of the forearm that move the hand and fingers

muscles-of-the-forearm-that-move-the-hand-and-fingers

Forearm Flexors, Extensors, and Wrist Support

The forearm muscles that move the wrist, hand, and fingers are grouped into anterior and posterior compartments. These muscles work together to bend, straighten, and stabilize the hand and digits. They also connect to the bones of the wrist and hand in organized layers. The anterior compartment contains the flexor muscles. These muscles usually start at the humerus and attach to the carpals, metacarpals, and phalanges. The superficial layer includes the flexor carpi radialis, palmaris longus,...

muscles that move the thigh

Hip Muscles That Move the Thigh

Hip muscles control thigh movement by connecting the pelvic girdle to the femur. The iliopsoas is one key muscle group. It is made of the psoas major and iliacus muscles. Both share a common insertion on the lesser trochanter of the femur. The gluteal muscles also play major roles. The gluteus maximus starts on the posterior ilium, sacrum, coccyx, and thoracolumbar fascia. It inserts on the iliotibial tract and the gluteal tuberosity of the femur. This muscle is the chief extensor of the femur.

muscles that move the leg

Thigh Muscles Behind Leg Motion

Thigh muscles help move the leg through flexion, extension, adduction, and rotation. They are grouped into the anterior, medial, and posterior compartments of the thigh. Each group supports a different part of leg motion at the hip and knee. The anterior compartment includes the quadriceps femoris, the most visible thigh muscle group. It helps extend the leg and flex the thigh. The quadriceps is made of four muscles: vastus lateralis, vastus medialis, vastus intermedius, and rectus femoris.

muscles of the leg that move the foot and toes

muscles-of-the-leg-that-move-the-foot-and-toes

Leg Muscle Groups for Foot Motion

The leg muscles that move the foot and toes are organized into the anterior, lateral, and posterior compartments. Each compartment has a distinct set of muscles with its own actions. Together, they control dorsiflexion, plantar flexion, inversion, eversion, and toe movement. The anterior compartment includes the tibialis anterior, extensor hallucis longus, extensor digitorum longus, and fibularis tertius. The tibialis anterior runs along the lateral surface of the tibia, is easy to feel, and...

key terms and concepts

Learn how the pectoralis major, latissimus dorsi, deltoid, rotator cuff, and coracobrachialis move the arm, with their key origins, insertions, and actions.

Arm Muscles and Their Movements | JoVE K12

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Arm Muscles and Their Movements

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