Arm and cubital fossaTo MBBS 1st year

Dr. Laxman Khanal

Asst. prof. Department of human anatomy

BPKIHS, Dharan, Nepal

15-10-2-17

Introduction

• The arm is the part of the upper limb between shoulder and elbow.

• The primary neurovascular bundle of the arm is located on themedial side of the arm, hence protected by the limb, which it serves.

• Nerve of arm: musculocutaneous nerve (C5,C6,C7)

Other nerves: radial nerve, median nerve & ulnar nerve

• Artery of arm: brachial artery

• Biceps and triceps are the large muscles of arm.

a. Coronoid fossab. Olecranon fossac. Radial fossad. Cubital fossa

a. Bicepsb. Tricepsc. Brachialisd. Coracobrachialis

a. Median nerveb. Radial nervec. Ulnar nerved. Axillary nerve

Which nerve is injured?

ML

• Brachial artery• Axillary artery• Subclavian artery

Skeletal framework

R C

Olecranon fossa

Honeymoon palsy

Saturday night palsyCrutch palsy

Which nerve is prone to be damaged ?Answer: Radial nerve

Ant compartment1. Biceps brachii2. Brachilais3. CoracobrachialisPost compartment1. Triceps muscle

Muscles of arm

Muscles of anterior compartment1. Biceps brachii• Flexion (elbow and shoulder)• Supination of forearm2. Brachialis3. Coracobrachialis

Powerful flexion occurs in supineposition than in prone position.

Radial tuberosity Ulnar tuberosity

Brachialis

Biceps brachii

Coracobrachialis

Bicipital aponeurosis

Triceps muscle1. Long head2. Lateral head3. Medial head

Profunda brachiiartery

Radial nerve

Branches of brachial artery1. Profunda brachii artery• Middle collateral• Radial collateral2. Nutrient artery3. Sup ulnar collateral artery4. Inferior ulnar collateral artery

Radial collateralMiddle collateral

Branches of brachial artery1. Profunda brachii artery• Middle collateral• Radial collateral2. Nutrient artery3. Sup ulnar collateral artery4. Inferior ulnar collateral artery

Nerves of arm

Radial nerve

Ulnar nerve

• Muscles of ant. compartment :by the musculocutaneous nerveexcept brachialis which hasadditional innervation by radialnerve.

• It pierce the coracobrachialisduring its course.

• The nerve ends as the lateralcutaneous nerve of the forearm.

Nerves of arm

Other nerves in arm1. Ulnar nerve2. Median nerve3. Radial nerve

Visual: See it !Auditory: Hear ? Say it !Read & write: Read it !Kinesthetic: Do it !

Know your own method of learning and use it to for effective learning.

Q. You are helping someone who wants to go to airport or the center of town or railway station. You would: a. go with her. b. tell her the directions. c. write down the directions. d. draw, or show her a map, or give her a map.

KA

RV

Roof: • Bicipital aponeurosis• Median cubital vein• Medial cutaneous nerve of forearm• Lateral cutaneous nerve of forearm• Superficial fascia

Cubital Fossa

Roof: • Bicipital aponeurosis• Median cubital vein• Medial cutaneous nerve of forearm• Lateral cutaneous nerve of forearm• Superficial fascia

Cubital Fossa

Basilic vein

Cephalic vein

#MBBR

Lat. Cutaneous nerve Med. Cutaneous nerve

MCV

BR