Arm (Muscle)

Question 1

Muscles of Anterior Department

Answer 1

Coracobrachialis (crosses only shoulder)
Biceps brachii (long and short head)
Brachialis (crosses only elbow)

Question 2

Brachioradialis

Answer 2

Not part of ant. compartment but is a flexor of elbow

• Lateral cutaneous nerve of forearm (vs musculocutaneous in ant. comp.)
• radial groove separates the attachment points of the lateral and medial heads

Question 3

Muscles of posterior compartment

Answer 3

Triceps brachi (long, lateral, medial)
-attach to olecranon of the ulna
Anconeus
-Mostly joint stabilizer and pulls synovial membrane

Question 4

Forearm Muslces: Anterior Compartment, superficial layer

Answer 4

PFPF

Pronator teres
-median n.
Flexor carpi radialis
-median n.
palmaris longis
-median n.
flexor ularis
-ulnar n. 

Function:
Pronator teres: Pronate wrist
All others flex wrist when working together

Come off medial epicondyl

Question 5

Intermediate Layer of Muscles

Answer 5

Fl. digitorum superficialis

-Fingers 2-5

Question 6

Deep layer of muscles

Answer 6

Flexor Pollicis Longus

• Flexes thumb
• median n.

Pronator quadratus

• pronates hand
• median n

Flexor digitorum profundus

• flexes finers
• median and ulnar nn.

Question 7

Rotators of radius

Answer 7

Supinator
Pronator teres
Pronator quadratus
-Initiates pronation
-Assisted by teres
-Helps hold radius and ulna together

Question 8

Superficial Muscles wrist extensors

Answer 8

Extensor Carpi Radialis Longus
Extensor Carpi Radialis
Extensor Carpi Ulnaris

Together they extend wirst

Question 9

Superficial Muscles: Forearm and phalange movers

Answer 9

Brachioradialis
Extensor digitorum
extensor digiti minimi

Question 10

5 Deep muscles (posterior)

Answer 10

Anconeus
–joint stabilizer

Supinator
-supinates the forearm. (with biceps brachii)

Abductor Pollicis Longus
-Thumbs up muscle

Extensor Pollicis Brevis
Etensor Pollicis Longus
-move your thumb out and dorsally, particularly the longus.

Extensor Indicis
-Extent index finger