16 Questions
What are the components of the brachial plexus?
Five roots, three trunks, six divisions, three cords, and five branches
Which spinal nerves contribute to the formation of the brachial plexus?
C5, C6, C7, C8, and T1
What is the role of the brachial plexus?
It supplies afferent and efferent nerve fibers to the chest, shoulder, arm, forearm, and hand
How are the five roots of the brachial plexus established?
The five anterior primary rami of the spinal nerves emerge at five different levels: C5, C6, C7, C8, and T1
What shape is used to identify part of the brachial plexus in cadaver dissections?
M or W shape
What nerve innervates the rhomboid muscles?
The dorsal scapular nerve
How many terminal branches does the brachial plexus have?
Five terminal branches
Which nerve originates in both C5 and C6?
The subclavian nerve
What is the prime mover in all forward-reaching and pushing actions?
The serratus anterior
How many trunks do the roots merge to form?
Three trunks
In the anatomical position, which divisions are superficial to the posterior divisions?
The anterior divisions
How many divisions do each trunk split into?
Two divisions
How do the six divisions regroup to become the cords?
They regroup by position with respect to the axillary artery
Which nerve arises from the lateral cord and is well connected to the median nerve?
The musculocutaneous nerve
What does the brachial plexus provide nerve supply to?
Skin and muscles of the arms
Which nerve supplies the trapezius muscle?
Spinal accessory nerve
Test your knowledge of the anatomy of the brachial plexus, a network of nerves formed by the lower cervical and first thoracic nerves, supplying nerve fibers to the chest, shoulder, arm, forearm, and hand.
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