muscles of upper limb

Question 1

ANTERIOR (FLEXOR) COMPARTMENT muscles

Answer 1

• Biceps brachii
• Coracobrachialis
• Brachialis

Question 2

POSTERIOR (EXTENSOR)
COMPARTMEN muscles

Answer 2

Triceps brachii
* Anconeus (mainly a forearm
muscle)

Question 3

innervationof anterior compartment muscles is via?

Answer 3

• Innervated by the
  MUSCULOCUTANEOUS NERVE (C5-7)

Question 4

• Arterial supply of anterior compartment muscles is via?

Answer 4

muscular
branches of the BRACHIAL ARTERY.

Question 5

BICEPS BRACHII(origin,insertion,action n innervation)

Answer 5

• Origin: short head – coracoid process of scapula
  long head – supraglenoid tubercle of scapula
• Insertions: radial tuberosity & fascia of forearm via bicipital aponeurosis
• Action: Supination of the forearm. It also
  flexes the arm at the elbow and at the
  shoulder
  innervation: musculocutaneous nerve
  (Most Powerful Supinator of the Forearm)

Question 6

.BRACHIALIS((origin,insertion,action n innervation)

Answer 6

• Origin: medial & lateral shaft of humerus
• Insertion: ulnar tuberosity
• Action: Flexion at elbow
  innervation: musculocutaneous nerve
  (MOST POWERFUL FLEXOR OF FOREARM)

Question 7

CORACOBRACHIALIS

Answer 7

origin: coracoid process
insertion: medial & anterior shaft of humerus
action: Flexion & adduction of arm at shoulder.
innervation: musculocutaneous nerve

Question 8

TRICEPS BRACHII((origin,insertion,action n innervation, blood supply))

Answer 8


origin:
Long head-infraglenoid tubercle of scapula;
medial head-posterior surface of humerus;
lateral head-posterior surface of humerus
insertion: olecranon

• Innervated by the RADIAL NERVE (C6-C8)
• Arterial supply is via muscular branches of the PROFUNDA BRACHII ARTERY
• Action: Extension of arm at elbow

Question 9

anconeus(origin,insertion,action n innervation, blood supply))

Answer 9

• Origin: lateral epicondyle of humerus
• Inserts onto lateral part of olecranon &
  ulna
  Actions: Assists the triceps extend the forearm &
  tenses capsule of elbow joint
• Also abduct the ulna during pronation of
  forearm
• Innervated by the RADIAL NERVE (C6-C8)
• Arterial supply is via muscular branches of the PROFUNDA BRACHII ARTERY

Question 10

DEEP ANTECUBITAL FOSSA anastomoses

Answer 10

• The radial recurrent artery (from the radial artery)
  anastomoses with the radial collateral artery;
  while the
• anterior and posterior ulnar recurrent arteries
  anastomose with the inferior and superior ulnar
  collateral arteries, respectively.

Question 11

POSTERIOR ASPECT anastomoses

Answer 11

• The radial collateral artery anastomose with
  middle collateral artery, the recurrent
  interosseous artery (from the posterior
  interosseous artery) and the posterior branch of
  the inferior ulnar collateral artery.

Question 12

cubital fossa borders

Answer 12

Consists of 3 borders, a roof & a floor
* Superior border – imaginery line between medial & lateral epicondyles
* Medial border – pronator teres
* Lateral border – brachioradialis
* Roof - bicipital aponeurosis, fascia, subcutaneous fat and skin
* Floor - brachialis (proximally) and supinator muscles of forearm & arm

Question 13

The major contents of the fossa from lateral to medial
are:

Answer 13

• Radial nerve – travels along the lateral border &
  divides into the superficial and deep branches
• Biceps tendon – passes centrally to attach to radial
  tuberosity and also contributes to the roof
• Brachial artery – bifurcates into ulnar & radial artery
  at apex. Can be palpated medial to biceps
• Median nerve - travels medially through the cubital
  fossa, exiting by passing between the two heads of
  the pronator teres