3B.2 ARM

Question 1

The humerus

Answer 1

• key landmarks:
  >head (articulate in the glenohumeral joint)
  >2 necks (anatomical which is the epiphysial plate and the surgical neck)
  >shaft
  > greater tubercle
  > lesser tubercle
  >intertubercular sulcus
  > deltoid tuberosity
  > medial epicondyle
  > lateral epicondyle
  > capitulum & trochlea (articulate elbow)
  >olecranon fossa (posteriorly)

Question 2

what muscles are in the Arm flexors compartment

Answer 2

• Biceps brachii
  long head
  short head

Supination: biceps

Shoulder flexion: coracobrachialis

Elbow flexion: brachialis, minor = bicipital aponeurosis

Nerves: Musculocutaneous (& radial)
- pierces coracobrachialis
- radial = 1/2 of brachialis in 70-80% of people

Question 3

rupture of the long head of the biceps

Answer 3

• popeye sign
  -not medically treated unless you want a better look

Question 4

musculocutaneous nerve

Answer 4

• in front of humerus
• pierces coracobrachialis

-it can be injuried and shoulder dislocation
> loss of shoulder flexion, forearm supination + elbow flexion

Question 5

arm extensors

Answer 5

• arm extension
  > long head

-forearm extension
>triceps (long, lateral + medial heads)

• Nerve: radial