Brachial Plexus

Brachial Plexus

Question 1. Root value of branchial plexus
Answer:

Branchial plexus is a network of nerves to supply the upper limb

Root value of branchial plexus Formation:

Ventral rami of C5, C6, C7, C8 & TI nerves join the plexus

Side Of The Neck ansa cervicalis and branches of the first cervical nerve distributed through the hypoglossal nerve

Branches are formed from root, trunk & cord

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“Importance of studying the brachial plexus for medical students: Questions explained”

Question 2. Spinal part of accessory nerve
Answer:

• Accessory nerve has a spinal root & cranial root
• The spinal root arises from a long spinal nucleus & extends from C1-C5 segments of spinal cord
• The nerve enters the cranium through the foramen magnum lying behind the vertebral artery
• Within cranium, it crosses jugular tubercle & reaches the jugular foramen
• The nerve leaves the skull through the middle part of the jugular foramen & fuses with the cranial root
• In the extracranial course, the nerve descends vertically between internal jugular vein & internal carotid artery & reaches to a point between angle of mandible & mastoid process
• The nerve enters posterior triangle of neck through posterior border of sternocleidomastoid & leaves by passing deep to the anterior border of the trapezium

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Structures Supplied by it:

• Sternocleidomastoid
• Trapezius