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Brachial Plexus Anatomy, Study notes of Anatomy

Aga Khan University (AKU)Anatomy

I have made hand written aesthetic and visually appealling medical notes about Brachial Plexus Anatomy in detail All of these notes are written and reviewed by me personally. This notes will help in learning and revision of Brachial Plexus. Subject- Anatomy Year-4th Course-MD/MBBS Author- My self (Dr Ahsan)

Typology: Study notes

2023/2024

Uploaded on 07/17/2024

unknown user
unknown user 🇵🇰

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bg1
Brachial
Plexus
Roots:-
5 roots, → C5 , C6 , C7 , C8 , T1
These roots merge to form 3 trunks
Upper trunk
C5 & C6 root Middle trunk
Continuation
Of C7 root
Lower trunk
C8 & TI
Divisions
Anterior division
Supplies Flexor
Muscle
Posterior Division
Supplies Extensor
Muscle
Table
&
-
-x
I
=>
=>>>
-
I
~
⑨
pf3
pf4
pf5

Partial preview of the text

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Brachial^ Plexus

Roots:-

5 roots, → C5 , C6 , C7 , C8 , T

These roots merge to form 3 trunks

Upper trunk C5 & C6 root Middle trunk Continuation Of C7 root Lower trunk C8 & TI Divisions Anterior division Supplies Flexor Muscle Posterior Division Supplies Extensor Muscle Table x^ &

^ I^ => I ~

Cords

The divisions recombine to form three cords named according to
their position relative to the axillary artery:
  • Lateral Cord: Formed from the anterior divisions of the upper and
middle trunks.
  • Posterior Cord: Formed from all three posterior divisions.
  • Medial Cord: Formed from the anterior division of the lower trunk. Major branches of brachial plexus Lateral Cord:
  • Musculocutaneous Nerve:
  • Innervates the coracobrachialis, biceps brachii, and brachialis muscles.
  • Provides sensation to the lateral aspect of the forearm.
  • Lateral Root of the Median Nerve:
  • Contributes to the formation of the median nerve. Medial Cord:
  • Medial Root of the Median Nerve:
  • Joins with the lateral root to form the median nerve.
  • Ulnar Nerve:
  • Innervates the flexor carpi ulnaris, medial half of the flexor digitorum profundus, and most intrinsic muscles of the hand.
  • Provides sensation to the medial one and a half fingers and the associated part of the hand.
  • Medial Cutaneous Nerves:
  • Medial cutaneous nerve of the arm and forearm provide sensation to the skin of the medial arm and forearm. Posterior Cord:
  • Axillary Nerve:
  • Innervates the deltoid and teres minor muscles.
  • Provides sensation to the skin over the deltoid (the “regimental badge” area).
  • Radial Nerve:
  • Innervates the muscles of the posterior arm and forearm (extensor muscles).
  • Provides sensation to the posterior aspect of the arm, forearm, and hand.

^ I^ #

I

The brachial plexus is responsible for cutaneous and muscular innervation of the entire upper limb, with two exceptions: the trapezius muscle innervated by the spinal accessory nerve (CN XI) and an area of skin near the axilla innervated by the intercostobrachial nerve Injuries to the brachial plexus affect both motor and sensory functions in the upper limb. Different injuries, such as inflammation, stretching, and wounds in the lateral cervical region of the neck or in the axilla may cause brachial plexus injuries, and the manifestations depend on the part of the plexus that is affected. In any case, injuries to the brachial plexus are followed by paralysis and anesthesia of the respective supply area of the affected nerves.

Injuries

Exceptions OH shit

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Brachial^ Plexus

Branches Cords Divisions Trunks Roots Musclocutaneous Axillary Radial Median Ulnar Upper Limb Movements

tin M