CAM102 Lecture Notes - Lecture 3: Flexor Pollicis Muscle, Aponeurosis, Flexor Digitorum Superficialis Muscle
3 Jul 2018
School
Department
Course
Professor
Muscles and Neurovascular Structures
of the Forearm
The forearm is the distal unit of the articulated strut of the upper limb
It extends from the elbow to the wrist
Contains two bones- radius and ulna.
The two bones are connected by the interosseus membrane.
Two muscle compartments- anterior and posterior compartments.
Muscles of the forearm act on the elbow, radioulanr, wrist, and/or hand joints.
The Cubital Fossa
Triangular region on the anterior part of the elbow joint
Superficially seen as a depression on the elbow (anterior aspect)
Boundaries of the cubital fossa:
-Lateral- brachioradialis muscle
-Medial- pronator teres muscle
-Superior- imaginary line connecting the medial and lateral epicondyles
of the humerus
Floor of the cubital fossa: brachialis (and supinator)
Contents of the cubital fossa (lateral to medial):
- Radial n (deep to brachioradialis)
-Biceps brachii tendon
-Terminal part of the brachial artery and origin of the radial and ulnar
arteries (termination of the brachial artery), accompanying veins
-Median nerve
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Roof of the cubital
fossa- superficial
and deep fascia
reinforced by the
bicipital
aponeurosis, and
skin
Blood vessels in the roof of the cubital fossa:
-Cephalic vein- lateral side
-Basilic vein- medial side
-Median cubital vein
Anatomical variation: median basilic and median cephalic veins.
Posterior Compartment of the Forearm
Mostly extensors at the wrist and/or digits
12 muscles- 7 superficial and 5 deep
Superficial Group:
1. Anconeus
Origin Insertion Innervation Movements
Lateral
epicondyle of
Lateral side of
the olecranon
Radial nerve Abducts ulna during
pronation
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the humerus and the upper
one-fourth of
the ulna
2. Brachioradialis
Origin Insertion Innervation Movements
Lateral
subracondylar
ridge of the
humerus
Lateral surface
of the distal
end of radius
Radial nerve Flexor at elbow
3. Extensor Carpi Radialis Longus
Origin Insertion Innervation Movements
Lateral
supraepicondyla
r ridge of
humerus
Dorsal aspect
of base of 2nd
metatarsal
Radial nerve Extend and abduct hand @
wrist joint
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Document Summary
The forearm is the distal unit of the articulated strut of the upper limb. It extends from the elbow to the wrist. The two bones are connected by the interosseus membrane. Two muscle compartments- anterior and posterior compartments. Muscles of the forearm act on the elbow, radioulanr, wrist, and/or hand joints. Triangular region on the anterior part of the elbow joint. Superficially seen as a depression on the elbow (anterior aspect) Superior- imaginary line connecting the medial and lateral epicondyles of the humerus. Floor of the cubital fossa: brachialis (and supinator) Contents of the cubital fossa (lateral to medial): Terminal part of the brachial artery and origin of the radial and ulnar arteries (termination of the brachial artery), accompanying veins. Roof of the cubital fossa- superficial and deep fascia reinforced by the bicipital aponeurosis, and skin. Blood vessels in the roof of the cubital fossa: Anatomical variation: median basilic and median cephalic veins. Mostly extensors at the wrist and/or digits.
