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.) Scaphoid Lunate Triquetrum 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 eminence- Adductor 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