Download Class # 12 - Dr. Robert Jordan

Class # 12
Forearm and Hand
Forearm muscles
Hand muscles and bones
Hand Bones
Page 8 bones book
Proximal Row of Carpels:
(starting thumb side, right to left, ant. surf.)
1. Scaphoid
2. Lunate
3. Triquetrum
4. Pisiform
Hand Bones
Distal Row
(right to left on anterior surface, starting on
thumb side)
5. Trapezium
6. Trapezoid
7. Capitate
8. Hamate (hook on ant. Surface)
Hand bones:
Proximal row= Some Lover’s Try Positions
Distal row= That They Can’t Handle
(right to left, anterior surface)
-Metacarpals
-Phalanges
Forearm muscles:
Flexors of the arm at the elbow joint:
-Biceps Brachii
-Brachialis
-Brachioradialis
O: Lat. Supracondylar ridge of humerus
I: Styloid process of radius
A: Flexion of arm at elbow joint
Forearm muscles
Pronation of Forearm: (page 29)
Pronator Teres and Pronator Quadratus
Pronator Teres
O: Medial epicondyle of humerus & coronoid
process of ulna
I: Middle of lateral shaft of radius
A: Pronation of forearm
Forearm muscles:
Pronator Quadratus
O: Distal fourth of ant. Ulna
I: Distal fourth of ant. Radius
A: Pronates forearm
Forearm muscles
Supination of Forearm:
Supinator p.30
O: Lat. Epicondyle of humerus & Proximal
ulna at supinator crest
I: Lat. Surface of proximal 1/3 of radius
A: Supination of forearm
Forearm muscles
Flexion of the wrist:
- Flexor Carpi Radialis
- Flexor Carpi Ulnaris
- Palmaris Longus (freq. Absent)
Flexors of the wrist
Flexor Carpi Radialis (p.36)
O: Medial epicondyle of humerus
I: Bases of 2nd and 3rd metacarpals
A: Flexion of wrist
Radial deviation
Flexors of the wrist
Flexor Carpi Ulnaris: (p.34)
O: Medial epicondyle of humerus
Proximal post ulna and olecranon process
I: Pisiform, Hamate and base of 5th metacarp.
A: Flexion of wrist
Ulnar deviation
Flexors of the wrist
Palmaris Longus (p.35)
Because it is often absent we will not be
covering it.
Extensors of the wrist
Extensor Carpi Radialis Longus
Extensor Carpi Radialis Brevis
Extensor Carpi Ulnaris
Nerve: Radial
Ext. of the wrist
Ext. Carpi Radialis Longus: (p.31)
O: Lat. Epicondyle of humerus
I: base of 2nd metacarpal
A: Ext. of wrist
Radial deviation
Ext. of the wrist
Ext. Carpi Radialis Brevis: (p.32)
O: Lat epicondyle of humerus
I: Base of 3rd metacarpal
A: Ext. of the wrist
Ext. of the wrist
Ext. Carpi Ulnaris: (p. 33)
O: Lat. Epicondyle of humerus
Post. Proximal ulna
I: base of 5th metacarpal
A: Ext. of the wrist
Ulnar deviation
Extension of the Digits
Extensor Digitorum p 37
Extensor Digiti Minimi p.38
Extensor Indicis p.39
Radial Nerve
Extension of the Digits
Extensor Digitorum p.37
O: Lat. Epicondyle of humerus
I: Extensor expansion of 4 fingers
A: Ext. of proximal phalanges of 4 fingers at
MP joints
Extension of the Digits
Extensor Digiti Minimi
O: Lat. Epicondyle of humerus
I: Extensor expansion of little finger
A: Ext. of proximal phalanx of little finger at
the MP joint
Extension of the Digits
Extensor Indicis
O: Posterior ulna and interosseous membrane
I: Extensor expansion of indicis finger
A: Ext. of proximal phalanx of index finger at
MP joint
Flexion of the Digits
Flexor Digitorum Superficialis p. 40
Flexor Digitorum Profundus p. 41
Profundus is deep to the Superficialis Muscles
Flexion of the Digits
Flexor Digitorum Superficialis
O: Medial epicondyle of humerus
Coronoid process of ulna
Ant oblique line of radius
I: Sides of the shafts of middle phalanges of 4
fingers at PIP joint
Flexion of the Digits
Flexor Digitorum Profundus
O: Middle of ant. Ulna and interosseous
membrane
I: Bases of distal phalanges of 4 fingers
A: Flexion of distal phalanges of 4 fingers at
DIP joints
Flexion & Extension of Thumb
Flexor Pollicis Longus
O: Middle of ant. Radius interosseous
membrane
I: Distal Phalanx of thumb
A: Flexion of distal phalanx of thumb at IP
joint
Extension of Thumb
Extensor Pollicis Longus
O: Posterior ulna and interosseous membrane
middle 1/3
I: base of distal phalanx of thumb
A: Ext. of distal phalanx of thumb at IP joint
Extension of Thumb
Extensor Pollicis Brevis
O: Posterior radius interosseous membrane
I: base of proximal phalanx of thumb
A: Ext. of proximal phalanx of thumb at MP
joint
Abduction of Thumb
Abductor Pollicis Longus p.45
O: Posterior radius
Posterior ulna
Interosseous membrane
I: base of 1st metacarpal
A: Abduction of 1st metacarpal of thumb at
CM joint
Intrinsic Thumb Muscles
Flexor pollicis brevis
Abductor pollicis brevis
Opponens pollicis
-All form the Thenar eminenceAdductor Pollicis
-forms the web space of the
thumb(ant.surface)
Intrinsic Hand Muscles
Flexor Digiti Minimi p. 50
Opponens Digiti Minimi p. 51
Abductor Digiti Minimi p. 52
-All forms the Hypothenar Eminence
Nerve: Ulnar
Intrinsic Hand Muscles
Dorsal Interossei p.53
A: ABduct the fingers N: Ulnar
-DAB
Palmer Interossei p.54
A: ADduct the fingers N: Ulnar
-PAD
Lumbricals (4)
A: Flexion fingers at MP Joints
Ext. of fingers at PIP and DIP joints
Anatomical Snuff Box