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Extensor retinaculum & dorsal digital expansion Dr.N.Mugunthan
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Extensor retinaculum & dorsal digital expansion Dr.N.Mugunthan
1.
EXTENSOR RETINACULUM & DORSAL
DIGITAL EXPANSION Lecture by Dr.N.Mugunthan.MBBS,MS,DNB,MNAMS,PhD. Professor of Anatomy SMIMS
2.
Learning objectives Extensor retinaculum •
Attachments • 6 compartments • Structures passing deep to it Dorsal digital expansion • Formation © Dr.N.Mugunthan
3.
Extensor retinaculum of
hand © Dr.N.Mugunthan
4.
Back of forearm Superficial
group: • *Brachioradialis • *Anconeus • *Extensor carpi radialis longus • Extensor carpi radialis brevis • Extensor digitorum • Extensor digiti minimi • Extensor carpi ulnaris Deep group: • Supinator • Abductor pollicis longus • Extensor pollicis longus • Extensor pollicis brevis • Extensor indicis © Dr.N.Mugunthan
5.
Back of forearm
cont… Superficial group: • *Brachioradialis • *Anconeus • *Extensor carpi radialis longus • Extensor carpi radialis brevis • Extensor digitorum • Extensor digiti minimi • Extensor carpi ulnaris Deep group: • Supinator • Abductor pollicis longus • Extensor pollicis longus • Extensor pollicis brevis • Extensor indicis © Dr.N.Mugunthan
6.
Extensor retinaculum Attachment: • Medial
end: styloid process of ulna, triquetral and pisiform • Lateral end: lower part of anterior border of radius © Dr.N.Mugunthan
7.
Extensor retinaculum cont… From
lateral to medial: following tendons are passing: • 1st compartment: abductor pollicis longus & extensor pollicis brevis tendons • 2nd compartment: extensor carpi radialis longus & brevis tendons • 3rd compartment: extensor pollicis longus tendon • 4th compartment: extensor indicis tendon, extensor digitorum tendon, anterior interosseous artery & posterior interosseous nerve • 5th compartment: extensor digiti minimi tendon • 6th compartment: extensor carpi ulnaris tendon © Dr.N.Mugunthan
8.
Anatomical snuff box Boundaries: •
Medial: tendon of extensor pollicis longus • Lateral: tendon of abductor pollicis longus & extensor pollicis brevis • Floor : styloid process of radius, scaphoid & base of 1st metacarpal • Roof : skin , superficial fascia which contains cephalic vein & deep fascia Contents : • Terminal part of radial artery © Dr.N.Mugunthan
9.
Dorsal digital expansion
of hand © Dr.N.Mugunthan
10.
Hand • 4 lumbricals Thenar
muscles • 1.Abductor pollicis brevis • 2.Flexor pollicis brevis • 3.Opponens pollicis • *Adductor pollicis (Deep muscle) Hypothenar muscles • 1.Flexor digiti minimi • 2.Opponens digiti minimi • 3.Abductor digiti minimi • *Palmaris brevis (superficial muscle) • 4 Palmar interosseous • 4 Dorsal interosseous © Dr.N.Mugunthan
11.
Hand cont… • 4
lumbricals Thenar muscles • 1.Abductor pollicis brevis • 2.Flexor pollicis brevis • 3.Opponens pollicis • *Adductor pollicis (Deep muscle) Hypothenar muscles • 1.Flexor digiti minimi • 2.Opponens digiti minimi • 3.Abductor digiti minimi • *Palmaris brevis (superficial muscle) • 4 Palmar interosseous • 4 Dorsal interosseous © Dr.N.Mugunthan
12.
Hand cont… • 4
lumbricals Thenar muscles • 1.Abductor pollicis brevis • 2.Flexor pollicis brevis • 3.Opponens pollicis • *Adductor pollicis (Deep muscle) Hypothenar muscles • 1.Flexor digiti minimi • 2.Opponens digiti minimi • 3.Abductor digiti minimi • *Palmaris brevis (superficial muscle) • 4 Palmar interosseous • 4 Dorsal interosseous © Dr.N.Mugunthan
13.
Hand cont… • 4
lumbricals Thenar muscles • 1.Abductor pollicis brevis • 2.Flexor pollicis brevis • 3.Opponens pollicis • *Adductor pollicis (Deep muscle) Hypothenar muscles • 1.Flexor digiti minimi • 2.Opponens digiti minimi • 3.Abductor digiti minimi • *Palmaris brevis (superficial muscle) • 4 Palmar interosseous • 4 Dorsal interosseous © Dr.N.Mugunthan
14.
Hand cont… • 4
lumbricals Thenar muscles • 1.Abductor pollicis brevis • 2.Flexor pollicis brevis • 3.Opponens pollicis • *Adductor pollicis (Deep muscle) Hypothenar muscles • 1.Flexor digiti minimi • 2.Opponens digiti minimi • 3.Abductor digiti minimi • *Palmaris brevis (superficial muscle) • 4 Palmar interosseous • 4 Dorsal interosseous © Dr.N.Mugunthan
15.
Dorsal digital expansion •
*Each extensor tendon covers the dorsal surface of head of metacarpal and proximal phalanx and forms triangular shaped dorsal digital expansion • Base: expansions forms a hood over metacarpal head • Apex: expansion at the distal end of proximal phalanx trifurcates into a median and two lateral bands. © Dr.N.Mugunthan
16.
• Lateral margin:
expansions of lateral margin receives the tendon of both lumbrical & interosseous • Medial margin: expansions of medial margin receives the tendon of interosseous only • Proximal wing tendons: contributed by palmar & dorsal interosseous tendons (join close to MCP joint) • Distal wing tendons: contributed by tendon of lumbricals (join close to proximal IP joint) Dorsal digital expansion cont…. © Dr.N.Mugunthan
17.
Summary Extensor retinaculum • Attachments •
6 compartments • Structures passing deep to it Dorsal digital expansion • Formation © Dr.N.Mugunthan