Arm mm - Origin, Insertion

Question 1

Biceps Brachii

***2 heads of origin - only 1 insertion point

Answer 1

Short head O - coracoid process

Long head O - supraglenoid tubercle, sup glenoid labrum (intracapsular) – long head runs through bicipital groove

I - radial tuberosity, forearm fascia (via bicipital aponeurosis/lacertus fibrosus)

Question 2

Coracobrachialis

Answer 2

O - coracoid process of scapula, conjoined tendon with short head of biceps

I - medial border of middle 1/3 of humerus

Question 3

Brachialis

Answer 3

O - distal 1/2 of anterior surface of humerus

I - coronoid process of the ulna, ulnar tuberosity

Question 4

Triceps Brachii

***2 heads of origin - one insertion point

Answer 4

Long head O - infraglenoid tubercle of glenoid

Lateral head O - posterior aspect of humerus and lateral border

Medial head O - posterior surface and medial border of humerus (inferior to radial groove)

I - olecranon process of ulna

Question 5

Anterior compartment of arm inn.

Answer 5

Musculocutaneous n (C5, C6, C7)

Question 6

Posterior compartment of arm Inn.

Answer 6

Radial n (C5-C8, T1)

Question 7

Long head of triceps brachii passes between what muscles inferiorly?

Answer 7

teres major and minor

Question 8

What is the only part of the triceps that crosses the shoulder joint?

Answer 8

long head of the triceps

Question 9

Lateral and long head of triceps join to form the…

Answer 9

superficial triceps

Question 10

Anterior mm of the arm (3)

Answer 10

1. biceps brachii
2. coracobrachialis
3. brachialis

Question 11

Posterior arm mm of the arm (2)

Answer 11

1. triceps brachii
2. anconeous