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Title: muscles acting on elbow and radio-ulnar joint
Description: muscles acting on elbow and radio-ulnar joint high quality pdf for physical therapy and medicines student.
Description: muscles acting on elbow and radio-ulnar joint high quality pdf for physical therapy and medicines student.
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Muscles acting on elbow
and radio-ulnar joints
Anatomy Lecture
Faculty of Medicine – Ain Shams University
Elbow joint
Type:
•Hinge synovial joint
...
• Humero-radial part:
capitulum of humerus
with upper surface of
head of radius
...
• Below, it is attached to
the margins of coronoid
and olecranon processes
of ulna, and the annular
ligament around the head
of radius
...
Posterior band between medial
epicondyle of humerus and
olecranon process of ulna
...
2) Radial collateral, it is
triangular in shape
...
Radio-ulnar articulations
1) Superior radio-ulnar joint, a pivot
synovial joint between head of
radius and radial notch of ulna
...
2) Middle radio-ulnar joint, a fibrous
joint (syndesmosis)
...
3) Inferior radio-ulnar joint, a pivot
synovial joint between head of ulna
and ulnar notch of radius
...
Articular disc
Anterior view
• Biceps brachii
...
• Brachioradialis
...
• Pronator quadratus (deep)
...
Triceps brachii
• Anconeus
...
Anconeus
1) Biceps brachii
Origin:
•
•
Short head: tip of coracoid
process of scapula (with
coracobrachialis)
...
Insertion:
• Radial tuberosity
...
Short head
Long head
Action:
• Flexion of the forearm
...
N
...
• Long head is Lateral, while
short head is medial
...
Insertion:
• Ulnar tuberosity and coronoid
process of ulna
...
Brachialis
3) Brachioradialis
Origin:
•
Upper 2/3 of the lateral
supracondylar ridge of
humerus
...
Brachioradialis
Action:
• Flexion of the forearm
specially in the mid-prone
position
...
4) Pronator teres
Origin:
•
•
Humeral head: lower 1/3 of medial
supracondylar ridge and medial
epicondyle of the humerus
...
Insertion:
• Middle 1/3 of the lateral surface of
radius
...
• Flexion of the forearm
...
Insertion:
• Lower ¼ of the anterior surface of
radius
...
N
...
Pronator
quadratus
6) Supinator
Origin:
•
Supinator crest of the ulna
...
Supinator
Action:
• Supination of the forearm
...
B:
Supinator crosses behind the superior
radio-ulnar joint, so it supinates the
forearm at this joint
...
Lateral head: upper 1/3 of
posterior surface of the
humerus (above spiral groove)
...
Insertion:
• Upper surface of the olecranon
process of ulna
...
• Its long head extends the arm
...
B:
Triceps brachii acts on both
shoulder and elbow joints
...
Insertion:
• Lateral side of the olecranon
process and upper ¼ of the
posterior surface of ulna
...
Anconeus
Nerve supply of muscles acting on
elbow and radio-ulnar joints
The muscle
Biceps + major part of
brachialis
Lateral fibers of brachialis,
brachioradialis, triceps, and
anconeus
Pronator teres
Pronator quadratus
The nerve supply
Musculo-cutaneous nerve
(lateral cord of brachial plexus)
Radial nerve
(post
...
Muscles crossing behind the elbow joint extends the forearm at
this joint (triceps, and anconeus)
...
Muscle crossing behind the superior radio-ulnar joint supinates the
forearm at this joint (supinator muscle)
...
•
Brachialis has double nerve supply (musculocutaneous and radial
nerves)
Title: muscles acting on elbow and radio-ulnar joint
Description: muscles acting on elbow and radio-ulnar joint high quality pdf for physical therapy and medicines student.
Description: muscles acting on elbow and radio-ulnar joint high quality pdf for physical therapy and medicines student.