Name: shoulder girdle muscles and scapula motion
Uploaded: 2024-03-28T14:28:28.000Z
Duration: 1 min 23 s
Channel: JoVE

K12 Standards

Florida Department of Education

High School

Life Science

SC.912.L.14

SC.912.L.14.20

Muscles of the Shoulder

Les muscles de l’épaule assurent la stabilité et la mobilité de l’articulation de l’épaule.
Les muscles antérieurs de l’épaule comprennent la sous-clavière, le petit pectoral et le dentelé antérieur.
La sous-clavière, un petit muscle qui s’étend de la première côte à la clavicule, stabilise la clavicule lors des mouvements de l’épaule.
Le petit pectoral, un muscle plat sous le grand pectoral, incline l’omoplate vers l’avant et la tire vers le bas. Il élève également le thorax, aidant à la respiration.
Le dentelé antérieur, un muscle en forme d'éventail sur la face latérale du thorax, prolonge l'omoplate, aidant aux mouvements de frappe.
Les muscles postérieurs de l’épaule comprennent le trapèze, l’omoplate releveuse et les rhomboïdes majeures et mineures.
Le trapèze, un grand muscle triangulaire, recouvre le dos et le cou, s’insérant sur la clavicule et l’omoplate. Il soulève, rétracte et fait pivoter l’omoplate, élève la clavicule et étend le cou.
Le releveur de l’omoplate, un muscle allongé situé dans la partie postérieure du cou, contribue à l’élévation et à l’adduction de l’omoplate.
Les muscles rhomboïdes majeurs et mineurs aident à rétracter l’omoplate et à la faire pivoter médialement.

muscles de l'épaule

Les muscles entourant la ceinture scapulaire, notamment la clavicule et la scapula, stabilisent principalement la scapula. Cette base stable permet aux autres muscles de déplacer efficacement l’humérus. Les mouvements scapulaires reflètent souvent ceux de l'humérus et étendent son amplitude de mouvement. Par exemple, lever le bras au-dessus de la tête ne serait pas possible sans une rotation simultanée de l’omoplate vers le haut.

Muscles thoraciques antérieurs

Les muscles thoraciques antérieurs comprennent le grand dentelé antérieur, le sous-clavier et le petit pectoral. Le grand dentelé antérieur, souvent appelé muscle du boxeur, commence de la première à la huitième ou à la neuvième côte. Il s'insère le long de l'angle supérieur et inférieur de la scapula ainsi que de son bord médial. Ce muscle est crucial pour l’abduction et la rotation de l’omoplate vers le haut. Lorsque l’omoplate est fixée, elle aide à élever les côtes, facilitant ainsi les mouvements de frappe.

Le grand pectoral relie la ceinture pectorale au thorax. Il provient de la surface antérieure des bords supérieurs de la deuxième ou troisième à quatrième ou cinquième côtes et s'insère sur le processus coracoïde de la scapula. Il incline la scapula vers l’avant et la tire vers le bas. Il élève également le thorax, facilitant ainsi la respiration.

Le muscle sous-clavier prend naissance sur la première côte et s'insère dans la surface inférieure de la clavicule latérale. Sa fonction première est de stabiliser la clavicule lors des mouvements des épaules et des bras. Il abaisse également la clavicule et la déplace vers l'avant.

Muscles thoraciques postérieurs

Les muscles thoraciques postérieurs comprennent le trapèze, les releveurs de l'omoplate et les muscles rhomboïdes mineurs et majeurs. Le muscle trapèze, l'un des muscles les plus larges et les plus distincts, trouve ses racines dans la structure osseuse des régions cervicales et thoraciques. Le muscle provient de la protubérance externe de l'os occipital, du ligament nuchae et de l'apophyse épineuse de la septième vertèbre cervicale et de toutes les vertèbres thoraciques. Il s'insère au niveau de la clavicule le long de son tiers latéral en plus de l'acromion et de l'épine de la scapula. Il est classé en trois parties : les fibres supérieures, moyennes et inférieures, chacune effectuant des actions uniques. Les fibres supérieures élèvent la scapula et étendent le cou, les fibres médianes adduitent la scapula et les fibres inférieures abaissent la scapula.

Les omoplates releveuses proviennent de l'apophyse transverse des vertèbres cervicales, C1-C4, et s'insèrent dans les omoplates à la partie supérieure de son bord médial. Il élève la scapula et provoque sa rotation vers le bas. Il fléchit également le cou latéralement.

Originaire du ligament nucal et des apophyses épineuses de C7 et T1, le petit rhomboïde s'insère dans le bord vertébral de la scapula, au-dessus de la colonne vertébrale. En revanche, le rhomboïde majeur part des apophyses épineuses du T2 jusqu'au bord vertébral de l'omoplate, inférieur à la colonne vertébrale. Ces muscles aident à rétracter l'omoplate et à la faire pivoter médialement.

Muscles de l'épaule

Les muscles de l’épaule assurent la stabilité et la mobilité de l’articulation de l’épaule.
Les muscles antérieurs de l’épaule comprennent la sous-clavière, le petit pectoral et ...

Education

Enseignement

JoVE Core

Anatomy and Physiology

Anatomie et physiologie

Unit 1

Unité 1

The Muscular System

Le système musculaire

KEY TERMS AND CONCEPTS

TERMES ET CONCEPTS CLÉS

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 and inferior angle of the scapula and its medial border. It abducts the scapula and rotates it upward. When the scapula is fixed, it can also help elevate the ribs during punching. The pectoralis major connects the pectoral girdle to the thorax. It begins on the front surface of the upper margins of the second or third to fourth or fifth ribs and inserts on the coracoid process of the scapula. This muscle tilts the scapula forward, pulls it downward, and helps elevate the thorax during breathing.

The subclavius muscle starts on the first rib and ends on the lower surface of the lateral clavicle. Its main job is to stabilize the clavicle during shoulder and arm movement. It also depresses the clavicle and moves it forward.

The posterior thoracic muscles include the trapezius, levator scapulae, rhomboid minor, and rhomboid major. The trapezius is a broad, distinct muscle that begins on the external protuberance of the occipital bone, the ligamentum nuchae, and the spinous process of the seventh cervical vertebra and all thoracic vertebrae. It inserts on the lateral third of the clavicle, the acromion, and the spine of the scapula. Its upper fibers elevate the scapula and extend the neck, its middle fibers adduct the scapula, and its lower fibers depress the scapula.

The levator scapulae originates from the transverse processes of cervical vertebrae C1 to C4 and inserts on the upper part of the medial border of the scapula. It elevates the scapula, turns it downward, and helps bend the neck to the side. The rhomboid minor starts from the nuchal ligament and spinous processes of C7 and T1, while the rhomboid major starts from the spinous processes of T2. Both insert on the vertebral border of the scapula, with the minor above the spine and the major below it. These muscles retract the scapula and rotate it medially.

Shoulder Girdle Muscles and Scapula Motion

shoulder-girdle-muscles-and-scapula-motion

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 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 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...

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 shoulder girdle muscles stabilize the scapula, support arm motion, and help with breathing, punching, and shoulder rotation.

Shoulder Girdle Muscles and Scapula Motion | JoVE K12

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Shoulder Girdle Muscles and Scapula Motion

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