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

腕の筋肉は、軸筋と肩甲骨筋に分類されます。
2つの軸筋は、大胸筋と広背筋です。
大胸筋には、腕の屈曲と伸展のための鎖骨頭と胸骨肋骨頭があります。広背筋は腕を伸ばします。大胸筋と広背筋の両方が腕を内転させ、内側に回転させます。
肩甲骨の筋肉は7つあります。 
大脳遠筋と広背筋は、腕の伸展、内転、および内側の回転を引き起こします。
三角筋は肩を覆って形作り、腕の外転、屈曲、伸展、内側と外側の回転を可能にします。
上肩甲骨領域の棘上筋は、腕の外転で三角筋を助けます。
肩甲骨後部の棘下筋は、腕の側方の回転を引き起こします。
 テレスマイナーは、棘下筋とともに伸展と側方腕の回転を引き起こします。
肩甲骨の前面に位置する肩甲下筋は、腕の内側の回転を引き起こします。
棘上筋、棘下筋、小腱板、および肩甲下筋は、それらに対応する腱とともに組み合わさって回旋筋腱板を作成します。
細長い腕の筋肉である烏口上腕筋は、腕の屈曲と内転を助けます。

腕を動かす筋肉

腕の動きには9つの筋肉が関与しています。 そのうちの 2 つ、大胸筋と広背筋は軸骨格に由来し、軸筋と呼ばれます。 残りの 7 つは肩甲骨に由来しており、肩甲骨筋と呼ばれます。 

大胸筋には 2 つの起源があります。 その鎖骨頭は鎖骨の内側半分から始まります。 対照的に、胸肋骨頭は、肋骨 1 から 6 の肋骨軟骨、胸骨、および前腹壁の外腹斜筋の腱膜から始まります。 これらの頭部は両方とも結合し、上腕骨の結節間溝に挿入されます。 鎖骨頭は上腕骨を屈曲させ、胸肋頭は屈曲した腕を解剖学的位置まで伸ばします。 頭部が連動すると、上腕骨が内転して内側に回転します。 

広背筋は、胸椎 T7 から T12、仙骨と腸骨の稜、肋骨 9 から 12 の棘突起から始まり、上腕骨の結節間溝に前方から挿入されます。 肩甲骨の筋肉である大円筋と連携して、上腕骨を伸展、内転、内側回転させます。 肩甲骨の筋肉の起始部である大円筋は肩甲骨の下角にあります。 それは、結節間溝の内側唇で上腕骨に挿入されます。 動作は広背筋と同じです。 

肩甲骨三角筋は肩関節の最も表面にある筋肉であり、その丸い形状を担っています。 その前線維は鎖骨の側面から始まり、側線維は肩甲骨の肩峰から始まり、後線維は肩甲骨の背骨から始まります。 すべての頭が結合して上腕骨の三角結節に挿入されます。 側線維が腕を外転させる間、前線維は腕を屈曲させて内側に回転させ、後線維は腕を伸長させて側方に回転させます。 

肩甲骨の筋肉、棘上筋、棘下筋、小円筋、肩甲下筋、およびそれらに対応する腱が組み合わされて回旋筋腱板を形成します。 棘上筋の起始部は肩甲骨の棘上窩にあります。 反対に、棘下筋は棘下窩から始まります。 これらの筋肉は両方とも上腕骨の大結節に挿入され、それぞれ腕の外転と側方回転を助けます。

別の筋肉である小円筋も上腕骨の大結節に挿入されていますが、肩甲骨の下角から始まります。 棘下筋とともに作用して、腕を側方に回転させたり、伸ばしたりします。 肩甲下筋の起始部は肩甲骨の肩甲下窩にあります。 上腕骨の小結節に挿入し、腕の内側回転を補助します。 最後に、腕の動きに関与する最後の肩甲骨筋は烏口腕筋です。 この筋肉の起始部は肩甲骨の烏口突起にあり、その付着部は上腕骨の内側軸の中間面にあります。 腕の屈曲と内転を助けます。

回旋腱板の筋肉は、特にスポーツをしている人に損傷を与えやすいです。 棘上筋は上腕骨頭と肩甲骨の肩峰の間に位置しているため、特に緊張や変性変化を起こしやすい筋肉です。

腕の筋肉は、軸筋と肩甲骨筋に分類されます。
2つの軸筋は、大胸筋と広背筋です。
大胸筋には...

Education

JoVE Core

Anatomy and Physiology

解剖生理学

Unit 1

ユニット1

The Muscular System

筋系

KEY TERMS AND CONCEPTS

主要用語と概念

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...

muscles that move the arm

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

anatomy and physiology

JoVE Core 解剖学と生理学では、人体の解剖学的および生理学的な詳細を、包括的で明確で魅力的なビデオ アニメーションで紹介します。このレッスン集は、人体の構造、コンポーネント、機能、要件に焦点を当てています。この知識を実際の医療および研究現場で応用することを実証する科学者による実際のビデオによって補完されています。

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Arm Muscles and Their Movements

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