Muscle Actions Quiz: Scapula Movements and Functions

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Questions and Answers

What is the action of the pectoralis minor muscle?

Scapula protraction, depression and medial rotation

Which nerve innervates the pectoralis minor muscle?

Medial pectoral nerve

What is the origin and insertion of the pectoralis minor muscle?

O: anterior surface of ribs 3-5, I: coracoid

What is the action of the serratus anterior muscle?

Scapula protraction, lateral rotation and keeps scapula against thoracic wall Signup and view all the answers

Which nerve innervates the serratus anterior muscle?

Long thoracic nerve Signup and view all the answers

What is the origin and insertion of the serratus anterior muscle?

O: lateral surfaces of ribs 1-8/9, I: medial border of scapula Signup and view all the answers

What are the actions of the trapezius muscle?

Scapula elevation, lateral rotation, retraction and depression Signup and view all the answers

Which nerves innervate the trapezius muscle?

Accessory nerve (motor) and anterior rami of C3 and C4 (sensory) Signup and view all the answers

What is the origin and insertion of the trapezius muscle?

O: nuchal line and external occipital protuberance of occipital bone; ligamentum nuchae; C7-T12 spinous processes, I: scapula spine, acromion and lateral clavicle Signup and view all the answers

What is the action of the levator scapulae muscle?

Scapula elevation Signup and view all the answers

What is the origin and insertion of the latissimus dorsi muscle?

The origin of the latissimus dorsi muscle is the T7-12 spinous processes, iliac crest, and lower 3-4 ribs, and the insertion is the intertubercular sulcus of the humerus. Signup and view all the answers

What is the origin and insertion of the lower (or k.a. lower) subscapular nerve?

The origin of the lower subscapular nerve is the inferior angle of the scapula, and the insertion is the intertubercular sulcus of the humerus. Signup and view all the answers

What is the action of the triceps brachii (long head) muscle?

The triceps brachii (long head) muscle is responsible for forearm extension at the elbow, as well as being an accessory adductor and extensor of the GH joint. Signup and view all the answers

What is the origin and insertion of the triceps brachii (long head) muscle?

The origin of the triceps brachii (long head) muscle is the infraglenoid tubercle of the scapula, and the insertion is the olecranon process of the ulna. Signup and view all the answers

What is the action of the supraspinatus muscle?

The supraspinatus muscle is a rotator cuff muscle that acts as a GH joint stabilizer and initiates GH abduction (first 15˚). Signup and view all the answers

What is the origin and insertion of the supraspinatus muscle?

The origin of the supraspinatus muscle is the supraspinous fossa of the scapula, and the insertion is the greater tubercle of the humerus. Signup and view all the answers

What is the action of the infraspinatus muscle?

The infraspinatus muscle is a rotator cuff muscle that performs lateral rotation of the GH joint. Signup and view all the answers

What is the origin and insertion of the infraspinatus muscle?

The origin of the infraspinatus muscle is the infraspinous fossa of the posterior scapula, and the insertion is the greater tubercle of the humerus. Signup and view all the answers

What is the action of the teres minor muscle?

The teres minor muscle is a rotator cuff muscle that performs lateral rotation of the GH joint. Signup and view all the answers

What is the origin and insertion of the teres minor muscle?

The origin of the teres minor muscle is the lateral border of the scapula, and the insertion is the greater tubercle of the humerus. Signup and view all the answers

What is the action of the subscapularis muscle?

The subscapularis muscle is a rotator cuff muscle that performs medial rotation of the GH joint. Signup and view all the answers

What is the origin and insertion of the subscapularis muscle?

The origin of the subscapularis muscle is the subscapular fossa of the anterior scapula, and the insertion is the lesser tubercle of the humerus. Signup and view all the answers

Study Notes

Muscles of the Scapula and Arm

Pectoralis Minor Muscle

Rotates the scapula downwards and forwards
Innervated by the medial pectoral nerve
Origin: 3rd to 5th ribs
Insertion: coracoid process of the scapula

Serratus Anterior Muscle

Rotates the scapula upwards and forwards, helping to raise the arm
Innervated by the long thoracic nerve
Origin: 1st to 9th ribs
Insertion: anterior surface of the scapula

Trapezius Muscle

Elevates, depresses, and rotates the scapula
Innervated by the spinal accessory nerve and the cervical nerves (C3 and C4)
Origin: base of the skull, ligamentum nuchae, and spinous processes of the 7th cervical and 1st thoracic vertebrae
Insertion: spine of the scapula, acromion process, and lateral clavicle

Levator Scapulae Muscle

Elevates the scapula

Latissimus Dorsi Muscle

Origin: spinous processes of the 7th thoracic to 12th thoracic vertebrae, thoracolumbar fascia, and iliac crest
Insertion: intertubercular groove of the humerus

Lower Subscapular Nerve

Origin: 5th and 6th cervical vertebrae
Insertion: subscapularis muscle

Triceps Brachii (Long Head) Muscle

Extends the elbow joint
Origin: infraglenoid tubercle of the scapula
Insertion: olecranon process of the ulna

Supraspinatus Muscle

Abducts the arm
Origin: supraspinous fossa of the scapula
Insertion: greater tubercle of the humerus

Infraspinatus Muscle

Laterally rotates the arm
Origin: infraspinous fossa of the scapula
Insertion: greater tubercle of the humerus

Teres Minor Muscle

Laterally rotates the arm
Origin: lateral border of the scapula
Insertion: greater tubercle of the humerus

Subscapularis Muscle

Medially rotates the arm
Origin: subscapular fossa of the scapula
Insertion: lesser tubercle of the humerus

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Description

Test your knowledge of scapula movements and muscle actions with this quiz! Learn about muscles like the Pectoralis Minor and Serratus Anterior, their innervation, origins, and insertions. Challenge yourself and improve your understanding of these important muscles.

Scapula Movements and Muscle Actions Quiz

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