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Class # 12. Forearm and Hand Forearm muscles Hand muscles and bones.

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Presentation on theme: "Class # 12. Forearm and Hand Forearm muscles Hand muscles and bones."— Presentation transcript:

1 Class # 12

2 Forearm and Hand Forearm muscles Hand muscles and bones

3 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

4 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)

5 Hand bones: Proximal row= Some Lover’s Try Positions Distal row= That They Can’t Handle (right to left, anterior surface) -Metacarpals -Phalanges

6 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

7 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

8 Forearm muscles: Pronator Quadratus O: Distal fourth of ant. Ulna I: Distal fourth of ant. Radius A: Pronates forearm

9 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

10 Forearm muscles Flexion of the wrist: - Flexor Carpi Radialis - Flexor Carpi Ulnaris - Palmaris Longus (freq. Absent)

11 Flexors of the wrist Flexor Carpi Radialis (p.36) O: Medial epicondyle of humerus I: Bases of 2 nd and 3 rd metacarpals A: Flexion of wrist Radial deviation

12 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 5 th metacarp. A: Flexion of wrist Ulnar deviation

13 Flexors of the wrist Palmaris Longus (p.35) Because it is often absent we will not be covering it.

14 Extensors of the wrist Extensor Carpi Radialis Longus Extensor Carpi Radialis Brevis Extensor Carpi Ulnaris Nerve: Radial

15 Ext. of the wrist Ext. Carpi Radialis Longus: (p.31) O: Lat. Epicondyle of humerus I: base of 2 nd metacarpal A: Ext. of wrist Radial deviation

16 Ext. of the wrist Ext. Carpi Radialis Brevis: (p.32) O: Lat epicondyle of humerus I: Base of 3 rd metacarpal A: Ext. of the wrist

17 Ext. of the wrist Ext. Carpi Ulnaris: (p. 33) O: Lat. Epicondyle of humerus Post. Proximal ulna I: base of 5 th metacarpal A: Ext. of the wrist Ulnar deviation

18 Extension of the Digits Extensor Digitorum p 37 Extensor Digiti Minimi p.38 Extensor Indicis p.39 Radial Nerve

19 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

20 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

21 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

22 Flexion of the Digits Flexor Digitorum Superficialis p. 40 Flexor Digitorum Profundus p. 41 Profundus is deep to the Superficialis Muscles

23 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

24 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

25 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

26 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

27 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

28 Abduction of Thumb Abductor Pollicis Longus p.45 O: Posterior radius Posterior ulna Interosseous membrane I: base of 1 st metacarpal A: Abduction of 1 st metacarpal of thumb at CM joint

29 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)

30 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

31 Intrinsic Hand Muscles Dorsal Interossei p.53 A: ABduct the fingersN: Ulnar -DAB Palmer Interossei p.54 A: ADduct the fingersN: Ulnar -PAD Lumbricals (4) A: Flexion fingers at MP Joints Ext. of fingers at PIP and DIP joints

32 Anatomical Snuff Box


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