Human Anatomy Vol 1

(mdmrcog) #1
UPPEH LIMB

FiE. 8.26: Sensory loss over back of forearm and dorsum of hand

through the radial groove, and before piercing the
lateral intermuscular septum, it divides into the anterior
and posterior descending branches which take part in
the anastomoses around the elbow joint (Fig. 8.10).

Bronches
L The radial collateral (anterior descending) artery is one
of the terminal branches, and represents the
continuation of the profunda artery. It accompanies
the radial nerve, and ends by anastomosing with the
radial recurrent artery in front of the lateral
epicondyle of the humerus (Fig. 8.21).
The middle collateral (posterior descending) artery is the
largest terminal branch, which descends in the
substance of the medial head of the triceps. It ends
by anastomosing with the interosseous recurrent
artery, behind the lateral epicondyle of the humerus.
It usually gives a branch which accompanies the
nerve to the anconeus.
The deltoid (ascending) branch ascends between the
long and lateral heads of the triceps, and
anastomoses with the descending branch of the
posterior circumflex humeral artery.
The nutrient nrtery to the humerzs is often present. It
enters the bone in the radial groove just behind the
deltoid tuberosity. However, it may be remembered
that the main artery to the humerus is a branch of
the brachial artery.

Mnemonics

. Brachial artery
. Tendon of biceps
. Radial nerve
Radial nerve: Muscles supplied (simplified) 'BEST
muscle"
Brachioradialis
Extensors of wrist
Supinator
Triceps brachii
Biceps brachii muscle: Origins
"You walk shorter to astreetcorner. You ride longer
on a superhighway"
Short head originates from coracoid process.
Long head originates from the supraglenoid tubercle.


Medial root of median nerve crosses the axillary
artery in front to join lateral root to form the
median nerve.
Median nerve, brachial afiery, tendon of biceps
brachii and radial nerve is the order of structures
from medial to lateral side in the cubital fossa.
Triceps brachii is the only active extensor of elbow
joint. Gravity extends the joint passively.
Biceps brachii is a strong supinator of the flexed
elbow, besides being its flexor.

In a motorcycle accident, there was injury to the
middle of back of arm

. What nerve is likely to be injured?
. What muscles are affected? Name five of them.
. What is the effect of injury?


a
partially are lateral and n"ledial heads of triceps
braclrii. A part of muscle escapes paralysis as it gets
supplied in the axilla,
The other muscles affected are the extensors of
forearm" These are brachioradialis, extensor carpi
radialis longus and trrevis, extensor digitorurn and
extensor pollicis longus.
The effect of injury is "Wrist drop".

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Cubital fossa contents
Red" or MBBR
From medial to lateral:

. Median nerve


//My Bottoms Turned
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