Regions and Compartments of the Arm

Question 1

Regions of the Upper Limb (3)

Answer 1

1. Arm: Shoulder to elbow; high ROM, low stability.
2. Forearm: Below the elbow; supports flexion/extension.
3. Hand: Beyond wrist; palm, fingers, thumb.

Question 2

Upper Arm Compartments (3)

Answer 2

1. Deltoid: Single compartment.
2. Anterior Compartment: Flexor muscles, brachial artery/vein, musculocutaneous, medial, ulnar nerves.
3. Posterior Compartment: Extensor muscles, radial nerve.

Question 3

Humerus
role (2)
shaft composed of ___, 3 borders, & 3 surfaces
performs what 2 movements
insertions on __ and ___

Answer 3

Role: Skeletal support, muscle attachment.
Shaft: Triangular cross-section, 3 borders (anterior, lateral, medial), 3 surfaces (anterolateral, anteromedial, posterior).
Flexion/extension: Insertions on proximal radius & ulna.

Question 4

Anterior vs. Posterior Arm Muscles
what are they separated by?

Answer 4

Anterior: Coracobrachialis, brachialis, biceps brachii.
Posterior: Triceps brachii.
Separated by: Medial/lateral intermuscular septa.

Question 5

Brachial Artery & Veins
artery: branches from __, ends at ___.
paired subcutaneous veins located on Medial/lateral sides of the artery.: (2)

Answer 5

Artery: Branches from axillary artery at teres major; ends at elbow (radial/ulnar arteries). Palpable along its length.
Paired Veins Subcutaneous Veins:
1. Basilic: Medial, becomes axillary vein.
2. Cephalic: Lateral, enters axilla.

Question 6

Nerves of the Arm (4)

Answer 6

1. Musculocutaneous: Motor to anterior muscles.
2. Median: Runs alongside brachial artery; anterior to elbow.
3. Ulnar: Medial to axillary artery; anterior forearm.
4. Radial: Posterior compartment; crosses to anterior at lateral epicondyle.

Question 7

Elbow Joint Overview
articulations
vascular supply

Answer 7

Articulations: 3 within 1 synovial cavity.
Vascular Supply: Anastomotic network from brachial, profunda brachii, radial, ulnar arteries.

Question 8

Cubital Fossa
transition between ___ & ___
floor composed of ___ muscle
contents lateral to medial (4)

Answer 8

Transition between arm & forearm (anterior to elbow).
Floor: Brachialis muscle.
Contents (L→M): Radial nerve, biceps tendon, brachial artery, median nerve.