Presentation on theme: "Nerves of the upper limbs Dr. M Koruji, PhD, Anatomical Sciences Department, TUMS."— Presentation transcript:
Nerves of the upper limbs Dr. M Koruji, PhD, Anatomical Sciences Department, TUMS
Roots Anterior rami of C5 to C8, and most of T1 Gray rami communicantes from the sympathetic trunk: postganglionic sympathetic fibers
Trunks The superior trunk : C5 and C6 roots; The middle trunk : C7 root; The inferior trunk C8 and T1 roots.
Divisions & Cords Divisions Anterior and a posterior division The three anterior divisions : anterior compartments of the arm and forearm; The three posterior divisions: the posterior compartments. Cords Lateral cord Medial cord Posterior cord
Dorsal scapular Originates from the C5 root Pierce the middle scalene muscle Innervates the rhomboid major and minor muscles
Long thoracic Originates from C5 to C7; Down the axilla to supply the serratus anterior muscle Lies on the superficial aspect of muscle
Suprascapular nerve Nerve to subclavius muscle
Cords Lateral cord(C5-C7) Lateral pectoral, Musculocutaneous nerve, Lateral root of median Medial cord(C8-T1) Medial pectoral, Medial cutaneous of forearm, Medial cutaneous of arm, Medial root of Median nerve Ulnar nerve Posterior cord(C5-T1) Upper subscapular, Thoracodorsal, Lower subscapular Axillary nerve Radial nerve
Muscolocutaneous nerve Motor innervation to all muscles in the anterior compartment of the arm; and Sensory innervation to skin on the lateral surface of the forearm.
Vasomotor to brachial artery
Medial cord 1. The medial pectoral nerve major muscle. 2. The medial cutaneous nerve of arm (medial brachial cutaneous nerve) 3. The medial cutaneous nerve of forearm (medial antebrachial cutaneous nerve) 4. The medial root of median nerve 5. The ulnar nerve
Posterior cord 1. The superior subscapular nerve; 2. The thoracodorsal nerve; 3. The inferior subscapular nerve;, 4. The axillary nerve; 5. The radial nerve
Axillary nerve Deltoid Teres minor Upper lateral cutaneous nerve of the arm
Radial nerve All muscles in the posterior compartments of the arm and forearm; The skin on the posterior aspect of the arm and forearm, the lower lateral surface of the arm, The dorsal lateral surface of the hand.
Radial nerve In Axilla Med head, post cut arm, long head
Radial nerve In Arm Lat. head Med. head Lower lat. Cut. arm Post. Cut. forearm
Radial nerve injury in the arm Wrist drop (due to denervation of the extensor muscles) sensory changes over the dorsum of the hand Wrist drop
1- Hard Tissue The upper limb skeleton (32) 2-Soft tissue Muscles Vessels Nerves 1- Shoulder Girdle 2- Arm (Brachium) 3- Forearm (Anti brachium) 4- Hand Upper limb
Nerves of forearm 1. Musculocutaneous nerve (lat.Cutaneous nerve of forearm) 2. Median nerve 3. Radial nerve 4. Ulnar nerve
Nerves of the Anterior Forearm
Median nerve musclucutaneous
Anterior interosseous nerve
Ulnar nerve Muscular branches Two small cutaneous branches Palmar branch supply skin on the medial side of the palm; The larger dorsal branch Posterior surfaces of the medial one and one-half digits.
Ulnar nerve injury Clawed-hand Metacarpophalangeal joints are hyperextended and the interphalangeal joints are flexed Damage to the ulnar nerve at the wrist : dorsal branch
Superficial terminal branch
Deep terminal branch(post. interosseous
Radial nerve Brachialis-Joint
Axi RT2T2 Cutaneous nerves of forearm and hand
Nerves of the Hand
Cutaneous Nerves and Superficial Veins of the Hand, Posterior View