Muscles of the arm (UE)

Question 1

What muscles are contained in the anterior compartment of the arm?

Answer 1

Biceps brachii, coracobrachialis, brachialis

Question 2

What muscle is contained in the posterior compartment of the arm?

Answer 2

Triceps

Question 3

What is the attachment point for the long head of the biceps brachii?

Answer 3

supraglenoid tubercle of the scapula (at the top of the glenoid fossa)

Question 4

What is the attachment point for the short head of the biceps brachii?

Answer 4

coracoid process of the scapula

Question 5

What is the attachment point for the distal end of the biceps brachii?

Answer 5

lands on the radius

Question 6

What is the innervation of the biceps brachii?

Answer 6

Musculocutaneous nerve (along with all other anterior compartment muscles)

Question 7

What are the actions of the biceps brachii?

Answer 7

Flex the elbow and supinate the forearm (turning hand so palm is open and face-up)

Question 8

What is the bicipital aponeurosis of the biceps brachii?

Answer 8

A landmark of connective tissue at the end of the biceps belly that lands on the forearm
(also a location to determine where the brachial artery is descending to the forearm/split into radial and ulnar arteries)

Question 9

What is the transverse humeral ligament of the biceps brachii?

Answer 9

A landmark which keeps the long head of the biceps tendon in place (goes across the greater tuberosity to the lesser tuberosity)
-covers bicipital groove

Question 10

What is bicipital tendonitis?

Answer 10

Inflammation that occurs in the long head of the biceps tendon under the transverse humeral ligament
*causes very distinct pain in that specific region

Question 11

What is a proximal rupture of the biceps?

Answer 11

The long head of the biceps tendon ruptures
-the muscle belly usually held by this tendon will slump down and forms a ball/bump in the arm
*usually treated surgically
*if surgery is not an option, short head can somewhat compensate

Question 12

What is a distal rupture of the biceps?

Answer 12

A tear of the biceps tendon that occurs in the distal attachment of the biceps brachii

Question 13

Which muscles sit deep to the biceps brachii?

Answer 13

brachialis and coracobrachialis

Question 14

What are the attachments of the coracobrachialis?

Answer 14

Attaches at the coracoid process of the scapula and anchors onto the mid portion of the humerus

Question 15

What is the innervation of the coracobrachialis?

Answer 15

Musculocutaneous nerve (along with all other anterior compartment muscles)

Question 16

What action is the coracobrachialis responsible for?

Answer 16

Flexion and adduction of the shoulder

Question 17

What are the attachments of the brachialis?

Answer 17

Attaches from the mid humerus to the ulnar bone

Question 18

What is the innervation of the brachialis?

Answer 18

Musculocutaneous nerve (along with all other anterior compartment muscles)

Question 19

What action is the brachialis responsible for?

Answer 19

Flexes the elbow with forearm in any position (supinate, pronate, neutral, etc.)

Question 20

What is the attachment point for the long head of the triceps?

Answer 20

the infraglenoid tubercle of the scapula (at the bottom of the glenoid fossa)

Question 21

What is the attachment point for the lateral head of the triceps?

Answer 21

On the humerus lateral to the spiral/radial groove

Question 22

What is the attachment point for the medial head of the triceps?

Answer 22

On the humerus medial to the spiral/radial groove
*deep to the other two heads of the triceps

Question 23

What is the attachment point for the distal end of the triceps?

Answer 23

The olecranon of the ulna (bony prominence)
-the heads of the triceps converge into a common tendon and anchor onto the bony process/olecranon
*bony lump you can feel on the back of the elbow

Question 24

What is the innervation of the triceps?

Answer 24

Radial nerve

Question 25

What actions are the triceps responsible for?

Answer 25

Extension of the elbow