Arm Muscles Flashcards Preview

620: Clinical Human Anatomy > Arm Muscles > Flashcards

Flashcards in Arm Muscles Deck (20)
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1
Q

Origin of the biceps brachii

A

Short head: Apex coracoid process

Long Head: Supraglenoid turbercle

2
Q

Insertion of the biceps brachii

A
Radial tuberosity (biceps tendon)
Deep fascia of anterior forearm (aponeurosis)
3
Q

What does the biceps brachii do?

A

Powerful flexor of elbow joint
Supinates the forearm
Weak flexor of shoulder joint (has small effect because it crosses over the GH joint anteriorly)

4
Q

What innervates the biceps brachii?

A

Musculocutaneous (C5, C6, C7)

5
Q

Origin of the corocobrachialis

A

Coracoid process

6
Q

Insertion of the corocobrachialis

A

Middle third of medial surface of humerus

7
Q

What does the corocobrachialis do?

A

Flexes arm
Adducts arm
Stabilizes glenohumeral joint

8
Q

What innervates the corocobrachialis?

A

Musculocutaneous (C5, C6, C7)

9
Q

Origin of the brachialis

A

Distal half of humerus

10
Q

Insertion of the brachialis

A

Coronoid process of ulna

11
Q

What does the corocobrachialis do?

A

Flexion of the elbow

12
Q

What innervates the corocbrachialis?

A

Musculocutaneous nerve

13
Q

Origin of the triceps brachii

A

Long Head: Infraglenoid tubercle of scapula
Medial Head: Posterior surface of humeral shaft, below radial groove
Lateral Head: Posterior surface of humerus, above radial groove

14
Q

Insertion of the triceps brachii

A

Olecranon process of ulna via common tendon

15
Q

What does the triceps brachii do?

A

Extends the elbow

16
Q

What innervates the triceps brachii?

A

Radial Nerve (C6, C7, C8)

17
Q

Origin of the anconceus

A

Lateral epicondyle of the humerus

18
Q

Insertion of the anconeus

A

Lateral surface of olecranon

Superior part of posterior surface of ulna

19
Q

What does the anconeus do?

A

Assists triceps in extending forearm

Stabilizes elbow joint

20
Q

What innervates the anconeus?

A

Radial Nerve (C7, C8, T1)