Movements & Support Of Shoulder Joint

Question 1

What are the basic structures in the nervous system?

What are their function?

Answer 1

Central nervous system (CNS):
- brain (skull)
- spinal cord (vertebral column)

Peripheral nervous system (PNS):
- cranial nerves
- spinal nerves

C7, T13, L7, S3, Cd20 (Spinal Nerves)
- leave spinal cord
- pass through intervertebral foramen
- paired left and right
- branches - dorsal branches supply’s dorsal structures

Question 2

Describe the origin and formation of the brachial plexus

Answer 2

C6, C7, C8, T1, T2 - form the brachial plexus (located in the axillary region)

• emerging nerves supply forelimb
• motor = efferent fibres - carry impulses from brain to structure e.g. muscle
• sensory = afferent fibres - carry impulses from structure to brain
• spinal reflexes = mixed nerves - transit messages in both directions at once

Branchial plexus supplies ALL intrinsic muscles

Brachial plexus supplies some extrinsic muscles;
- latissimus dorsal (retractor)
- serratus ventralis (protractor & retractor)
- pectoralis (adductor)