Arm Flashcards

1
Q

Give Origin, Insertion, Innervation and Action of:

Biceps Brachii

A

Origin:
Long head = Supraglenoid tubercle of scapula
Short head = Coracoid process of scapula

Insertion:
Tuberosity of the radius and fascia of the forearm (via Bicipital aponeurosis)

Innervation:
Musculocutaneous (C5,6,7)

Action:

  • Main supinator of the forearm
  • When supine, flexes forearm
  • Short head helps resist dislocation of shoulder
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2
Q

Give Origin, Insertion, Innervation and Action of:

Brachialis

A

Origin:
Anterior side of distal half of humerus

Insertion:
Coronoid process of ulna
Tuberosity of the ulna

Innervation:
Musculocutaneous nerve (C5,6,7)

Action:
Flexion of the forearm

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3
Q

Name the muscles in the anterior arm

A

Biceps Brachii
Brachialis
Coracobrachialis

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4
Q

Give Origin, Insertion, Innervation and Action of:

Coracobrachialis

A

Origin:
Coracoid process

Insertion:
Middle third of medial humerus

Innervation:
Musculocutaneous Nerve (C5,6,7)

Action:
Flexion of the arm
Help with Adduction of arm
Prevent dislocation of the shoulder

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5
Q

Name the muscle in the posterior arm

A

Triceps Brachii

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6
Q

Give Origin, Insertion, Innervation and Action of:

Triceps Brachii

A

Origin:
Long head: Infaglenoid tubercle of the scapula
Medial head: Posterior humerus (inferior to radial groove)
Lateral head: Posterior humerus (superior to radial groove)

Insertion:
Proximal Olecranon process + fascia of forearm

Innervation:
Radial Nerve (C5,6,7,8,T1)

Action:
Extension of forearm
Long head helps resist shoulder dislocation
Long head helps adduct arm

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