Download Muscles

Kinesiology
PED 2440
Muscles
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KEY POINTS:
1. Muscles only PULL on bones
2. Muscles only act on those joints which they cross
3. A muscle (usually) can not cause an opposite
action (e.g. flexion and extension)
4. Origin = stable end; closer to the body
5. Insertion = movable end; further from the body
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Pictures of the wrist and hand muscles
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Look to the name of the muscle for help
Flexor Carpi Radialis
Palmar surface
Origin:
medial condyle of the
humerus
Insertion:
base of the 2nd and 3rd
metacapals (palmar
surface)
Actions:
flexion of the wrist
abduction of the wrist
flexion of the elbow
Flexor Carpi Ulnaris
Palmar
Origin:
medial condyle of the
humerus
Insertion:
pisiform, base of the 5th
metacarpal
Actions:
flexion of the wrist
adduction of the wrist
flexion of the elbow
Palmaris
Palmar
Origin:
Medial epicondyle
Insertion:
Palmar aponeurosis of 2-5
metacarapls
Action:
flexion of the wrist
weak flexion of the elbow
Flexor Digitorum
Superficialis
Palmar
Origin:
medial condyle of the humerus
ulnar head - medial coronoid area
radial head - radial tuberosity area
Insertion:
split tendons attach to the sides of
the middle phalanx of the four
fingers
Actions:
flexion of fingers, wrist and the
elbow (weak)
Flexor Digitorum
Profundus
• Palmar
• Origin:
– Upper, medial surface of the ulna
• Insertion:
– split tendons attach to distal phalanx of
the four fingers
• Actions:
– flexion fingers and wrist
Flexor Pollicus Longus
Palmar
Origin:
middle anterior surface of
the radius
Insertion:
base of the distal phalanx of
the thumb (palmar surface)
Actions:
flexion of wrist and thumb
Extensor Carpi Radialis Longus
Dorsal
Origin:
lateral condyle of the humerus
Insertion:
base of the 2nd metacarpal
Actions:
Extension of the wrist;
Abduction
Weak extension of the elbow
NOTE: Extensor Carpi Radialis Brevis
will not be covered
Extensor Carpi Ulnaris
Dorsal
Origin:
lateral epicondyle of the
humerus
Insertion:
base of the 5th metacarpal
Actions:
Extension of the wrist
Adduction of the wrist
Weak extension of the elbow
Extensor Digitorum
Dorsal
Origin:
lateral epicondyle of the
humerus
Insertion:
middle and distal phalanges of
the four fingers
Actions:
Extension of the fingers
Extension of the wrist
Weak extension of the elbow
Extensor Indicis
• Dorsal
• Origin:
– Distal, posterior ulna
• Insertion:
– middle and distal phalanxes of the
second phalange
• Actions:
– Extension of the 2nd finger
– Weak wrist extension
Extensor Digiti Minimi
• Dorsal
• Origin:
– Lateral epicondyle of the humerus
• Insertion:
– Base of the middle and distal
phalanxes of the 5th phalange
• Actions:
– Extension of the 5th finger
– Weak wrist extension
Extensor Pollicis Longus
Dorsal
Origin:
posterior lateral surface of the
distal ulna
Insertion:
base of the last phalanx of the
thumb (dorsal side)
Actions:
Extension of the wrist
Extension of the thumb
NOTE: The extensor pollicus brevis and
the abductor pollicus will not be covered.
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Summary
Table 7.1 except for the Extensor Carpi
Radialis Brevis, Extensor Pollicus Brevis,
and Abductor Pollicus Longus
• Quiz
– Bones
– Joints and their Actions
– Muscles
• Location
• Actions
– Other info
Flexion
• Besides their actions, what
do they have in common?
– Flexor carpi radialis
– Flexor carpi ulnaris
– Flexor digitorum
superficialis
– Flexor digitorum
profundus
– Flexor pollicus
– Palmaris longus
Extension
Besides their actions, what do they have in common?
Extensor carpi radialis
Extensor carpi ulnari
Extensor digitorum
Extensor digiti minimi
Extensor indicis
Extensor pollicus longus
Radial Flexion (Abduction)
Besides their actions, what do they have in common?
Ext. carpi radialis
Flexor carpi radialis
Abductor pollicis
(ext. pollicis longus and brevis)
Ulnar Flexion (Adduction)
Besides their actions, what do they have in
common?
Extensor carpi ulnaris
Flexor carpi ulnaris
Thumb Actions
Flexor pollicis longus
Extensor pollicis longus and brevis
Nerves and Arteries
Nerves (p. 140, 141)
Median
Anterior and later
muscles of the forearm
and radial side of hand
Ulnar
Anterior and medial
forearm and ulnar side
of hand
Radial
Posterior forearm. No
hand muscles Arteries
Radial - anterior
Arteries
• Radial – anterior at
wrist and posterior
to the hand
• Ulnar - anterior