Brachial Plexus Flashcards
What muscles does the Musculocutaneous Nerve innervate?
- Coracobrachi
- Brachioradialis
- Biceps brachii
What cutaneous part of the upper limb does the Musculocutaneous nerve innervate?
- Later side of forearm skin
What actions is the Musculocutaneous nerve responsible for?
CB: Shoulder flexion and adduction
BR: Flexes elbow joint
BB: Flexes elbow and supinate
What sensory part of the upper limb does the Axillary nerve innervate?
the over shoulder
What muscles does the axillary nerve innervate?
Deltoid muscle and Teres minor
What action does the axillary nerve perform?
D: Abduction, flexion of shoulder and extension.
TM: External rotation of shoulder
What cutaneous part of the upper limb does the radial nerve supply?
- Skin of arm, forearm,
- back of hand [thumb fingers 1 and 2 not including the finger tips of fingers]
What muscles does the radial nerve innervate?
POSTERIOR:
- Triceps brachii
- Anconeus
ALL EXTENSORS:
- Brachioradialis
- Extensor carpi radialis longus and brevis
- Extensor digitorum
- Extensor indicis
- Extensor digiti minimi
- Extensor carpi ulnaris
- Abductor policis longus
- Extensor policis longus and brevis
- Supinator
What action is the Radial nerve responsible for?
Elbow extension, wrist extension and thumb abduction/extension.
What cutaneous part of the upper limb does the median nerve innervate?
- finger tips [lateral digits] of fingers 2 and 3 and thumb and nail beds.
- ventral lateral palm.
What muscles does the median nerve innervate?
FLEXOR COMPARTMENT:
- pronator teres and quadratus
- flexor carpi radialis
- palmaris longus
- flexor digitorum superficialis
- flexor digitorum profundus (RADIAL HALF)
- 2nd and 3rd lumbrical muscles
- oponens pollicis brevis
- flexor pollicis brevis
- abductor pollicis brevis
What action is the median nerve responsible for?
wrist pronation, wrist flexion, flexes digits, opposition (thumb to other fingers), thumb abduction.
What cutaneous part of the upper limb does the ulnar nerve innervate?
- Medial 1 & 1/2 digits [both palmar and dorsal]
- both sides of medial palm
What muscles does the ulnar nerve innervate?
- Adductor pollicis brevis
- flexor carpi ulnaris
- ulnar half of flexor digitorum profundis.
- oponnens digiti minimi
- flexor digiti minimi
- abductor digiti minimi
What is the order of the brachial plexus from left to right?
Remember To Drink Cold Beer
Roots, Trunks, Divisions, Cords, Terminal Branches
How many roots are there?
5
How many trunks are there and their classification?
3,
upper
middle
lower
What are the divisions of the bracial plexus?
Anterior and posterior there are 6
2 for each trunk.
How many cords are there and what are they called?
Lateral cord
Posterior cord
Medial cord
where does the axillary nerve run through?
quadrangular space
what are the sides of the quadrangular space?
Superior: teres minor
Inferior: teres major
Lateral side - Surgical neck of humerus
Medial - long head of triceps brachii
What are the different sides of the triangular interval?
Medially - triceps long head
Superiorly - teres major
Laterally - humerus
What is responsible for wrist drop?
Radial nerve
what injury is the axillary nerve at risk of?
- a shoulder dislocation or subluxation
- surgical neck of humerus fracture
