Anood Alassaf :’) faculty of medicine … A second year victim We’ll be talking about: Spinal cord and spinal nerves Brachial plexus Brachial plexus It can be your worst nightmares unless you follow up your lectures a day by day Doctors love to ask a bout it in the exams Medical important … you’ll know it by yourself And why should I care? Anood Alassaf :’) faculty of medicine … A second year victim

Vertebral column: 33 vertebrae 26 bone 5 of them fuse to make the sacrum = considered 1 bone 4 fuse to form the coccyx

Divided into 31 segment Base of the brain At each segment From each sides there is a spinal nerve Between L1 and L2

31 segments 8 cervical 12 thoracic 5 lumbar 5 sacral 1 coccygeal Here it’s different 31 segments 8 cervical 12 thoracic 5 lumbar 5 sacral 1 coccygeal In the thoracic part: Each spinal nerve arises from its corresponding segment below the corresponding vertebra

Then each spinal nerve divides into: Anterior ramus and posterior ramus

Brachial plexus Is a network of nerve fibers (anterior rami) running from the spinal cord, formed by the lower four cervical and first thoracic (C5  T1 ) Proceeds through the neck, axilla, into the arm Gives off many nerves that supply the shoulder, chest, and arms

trunks divisions

M 3 1 2 5 4 cords trunks roots Terminal branches divisions c5 anterior superior 2 lateral c6 12 posterior anterior 13 5 posterior posterior middle c7 11 posterior 4 10 9 c8 medial anterior inferior T1 8 7 6 Posterior cord: Upper subscapular nerve (9) Lower subscapular nerve (10) Middle subscapular nerve = Nerve to latissimus dorsi = thoraco dorsal (11) Axillary nerve (12) Radial nerve (13) ULMAR Lateral cord: Musculocutaneous nerve (1) Lateral root of median nerve (2) Lateral pectoral nerve (3) MLL Medial cord: Ulnar nerve (4) Medial root of median nerve (5) Medial pectoral nerve (6) Medial cutaneous nerve of the arm(7) Medial cutaneous nerve of the forearm(8) UMMMM