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Osmosis
ANATOMY OF THE ARM
Figure 1. A Anterior view of upper arm, B anterior view with biceps brachialis removed, C posterior
view of upper arm.
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Figure 2. Anterior view of arm showing A arteries and deep veins and B superficial veins.
Figure 3. Anterior view of nerves of the upper arm.
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Muscle
Osmosis
Proximal
Insertion
Distal
Insertion
Innervation
Action
ANTERIOR COMPARTMENT
Biceps brachii
Short head
Coracoid
process of
scapula
Long head
Supraglenoid
tubercle of
scapula
Tuberosity
of the
radius
Fascia of
the forearm
via bicipital
aponeurosis
Musculocutaneous
nerve (C5,
C6, C7)
Helps
supinate
forearm
Prevents
dislocation
of shoulder
joint
Flexes
elbow joint
Minor role
in adducting
glenohumeral
joint
Coracobrachialis
Coracoid
process of
scapula
Middle 1/3
of
anteromedial
surface of
humeral
midshaft
Musculocutaneous
nerve (C5,
C6, C7)
Flexes
glenohumeral
joint
Adducts
glenohumeral
joint
Stabilizes
joint
Brachialis
Distal 1/2 of
anterior
surface of
the
humerus
Coronoid
process &
tuberosity
of ulna
Musculocutaneous
nerve (C5,
C6, C7)
Radial
nerve (C5T1)
Flexes
forearm at
elbow joint
POSTERIOR COMPARTMENT
Triceps brachii
Long head
Infraglenoid
tubercle of
scapula
Olecranon
& fascia of
forearm
Radial
nerve (C5T1)
Lateral head
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Long head
Extension of
forearm
Stabilizes
glenohumeral
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Posterior
surface of
humerus,
superior to
radial
groove
joint when
adducted
Adducts &
extends
glenohumeral
joint
Medial head
Medial head
Posterior
surface of
humerus,
inferior to
radial
groove
Anconeus
Lateral
epicondyle
of humerus
Extension of
forearm
Lateral head
Extension of
forearm
against
resistance
Lateral
surface of
olecranon &
proximal
ulna
Radial
nerve (C5T1)
Extends
forearm
Adds
stability to
elbow joint
UNLABELLED DIAGRAMS
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