1 / 62

WRIST COMPLEX

WRIST COMPLEX. Bones and Joints of the Wrist. Proximal Row of Carpal Bones. Review- testable Scaphoid: Most lateral. Forms floor of anatomical snuff box. Most commonly fractured wrist bone. Fractures may compromise radial artery in snuff box. Articulates with radius.

jana
Download Presentation

WRIST COMPLEX

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. WRIST COMPLEX Bones and Joints of the Wrist

  2. Proximal Row of Carpal Bones • Review- testable • Scaphoid: Most lateral. Forms floor of anatomical snuff box. Most commonly fractured wrist bone. Fractures may compromise radial artery in snuff box. Articulates with radius.

  3. Proximal Row of Carpal Bones • Lunate: Articulates with radius • Triquetral: Articulates with ulna (via articular (ulnar) disc) during extreme ulnar deviation. • Pisiform: Sesamoid bone Forms in tendon of the flexor carpi ulnaris

  4. Distal Row of Carpal Bones: • Trapezium: Most lateral • Trapezoid • Capitate • Hamate

  5. Distal Row of Carpal Bones: • Entire complex enclosed in a common synovial membrane. • Articulations are plane joints that perform gliding motions.

  6. Radiocarpal Joint • Condyloid (ellipsoidal) synovial joint. • Two degrees of freedom. • Articular surfaces: Scaphoid (convex) Lunate (convex) Distal radius: Two concave fossae (lateral and medial) Triquetral (convex) Only during extreme ulnar deviation

  7. Radiocarpal Joint Ligaments • Lateral (radial) collateral ligament. • Medial (ulnar) collateral ligament. • Dorsal radiocarpal ligament. • Palmar radiocarpal ligament. • Strengthen capsule

  8. Radiocarpal Joint Functions • Some flexion and extension • Ulnar deviation

  9. Radiocarpal Joint Arteries • Articular arteries • Arise from dorsal and palmar carpal arches.

  10. Radiocarpal Joint Nerves • Anterior interosseous branch of median nerve. • Posterior interosseous branch of radial nerve. • Dorsal and deep branches of the ulnar nerve.

  11. Radiocarpal Joint Injuries • Colle’s fracture • Scaphoid fracture Usually at “waist” Compromises radial artery in snuffbox

  12. Midcarpal Joint • Made up of intercarpal joints: Between proximal and distal rows of carpals and between carpals. • Movements: Some flexion and extension. Radial deviation (abduction). Especially due to movement of head of capitate in its socket. • Enclosed within synovial capsule.

  13. Midcarpal Joint • Ligaments: Dorsal ligaments. Palmar ligaments. Interosseous ligaments. • Nerves and arteries: Same as for radiocarpal.

  14. Palmar Structure Sequence(radial to ulnar) • Radius • Radial artery • Flexor carpi radialis tendon • Median nerve: Under palmaris longus tendon

  15. Palmar Structure Sequence(radial to ulnar) • Flexor digitorum superficialis tendons • Ulnar artery • Ulnar nerve • Flexor carpi ulnaris tendon

  16. HAND

  17. Carpometacarpal Joints • Plane synovial joints: • Motion: None for digits 2-3 Limited for 4 More mobile for 5

  18. Carpometacarpal Joints • Saddle (sellaris) joint between metacarpus and trapezium: • Movements: Abduction/adduction Flexion/extension Circumduction Opposition

  19. Metacarpophalangeal Joints • Condyloid synovial joints • Movements: Flexion/extension Abduction/adduction Some opposition at MCP 5 • Capsular ligaments: Palmar ligaments (pads) Collaterals

  20. Interphalangeal Joints • Synovial hinge joints • Only flexion/extension allowed • Ligaments: Strong collaterals • Proximal interphalangeal joints (PIPs) • Distal interphalangeal joints (DIPs)

  21. Dorsal Venous Drainage • Dorsal venous arch drains hand dorsum. • Medially drains into basilic. • Laterally drains into cephalic.

  22. Lymphatic Drainage • Medial via lymph vessels accompanying basilic vein to: Supratrochlear nodes to: Lateral axillary nodes. • Lateral via lymph vessels accompanying cephalic vein to: Infraclavicular nodes to: Lateral axillary nodes.

  23. Arterial Supply to Dorsum • Via dorsal arterial arch from: Radial and ulnar arteries. • Dorsal metacarpals. • Dorsal digitals.

  24. Muscles of Dorsum of Hand • Long extensor tendons. • Dorsal interosseous muscles (4): Attachments: DAB: Abductors Middle finger is reference Middle finger has two First and fifth digits have none.

  25. Long Extensors

  26. Superficial Palm • Palmar aponeurosis • Flexor retinaculum • Palmaris brevis

  27. Palmar Aponeurosis • Triangular layer of deep fascia located between two eminences. • Provides protection for superficial vessels, nerves, and tendons. • Anchored to skin and flexor retinaculum. • Splits into four slips that blend with fibrous flexor sheaths of four medial digits (II – V).

  28. Flexor Retinaculum • = Transverse carpal ligament. • Laterally attaches to tubercles of scaphoid and trapezium. • Medially attaches to hook of hamate and pisiform.

  29. Palmaris Brevis Muscle • O: Flexor retinaculum and palmar aponeurosis. • I: Skin on medial side of palm. • A: Tenses skin on palm.

  30. Carpal Tunnel Contents • Long flexor tendons of: Flexor digitorum superficialis Flexor digitorum profundus Flexor pollicis longus • Median nerve • Note: ulnar nerve and artery pass through Guyon’s canal.

  31. Long Flexors

  32. Intrinsic Muscles of the Thumb • Thenar eminence: • Adductor pollicis: Innervation: Deep branch of ulnar nerve (C8, T1).

  33. Thenar Eminence Muscles • Abductor pollicis brevis • Flexor pollicis brevis • Opponens pollicis • Innervation: Recurrent branch of median nerve (C8, T1).

  34. Thenar Muscles

  35. Hypothenar Eminence • Intrinsic muscles for digit V. • Abductor digiti minimi • Flexor digiti minimi brevis • Opponens digiti minimi • Innervation: Ulnar nerve

  36. Hypothenar Muscles

  37. Long Digital Flexors • Flexor digitorum superficialis • Flexor digitorum profundus

  38. Flexor Digitorum Superficialis • Flexes PIP (and MCP and wrist). • Each tendon passes through fibrous flexor sheath. • Each tendon bifurcates opposite proximal phalanx. • Each tendon inserts on middle phalanx.

  39. Flexor Digitorum Profundus • Flexes DIP (and PIP and MCP). • More active than superficialis. • Each tendon inserts on distal phalanx.

  40. Vinculae • Small vascular bundles connecting palmar surface of phalanges with long flexor tendons. • Long and short

  41. Long Flexors

  42. Dorsal Interossei • Four bipennate muscles. • Each arises via two heads from adjacent sides of two metacapals.

  43. Dorsal Interossei • Insertion: Onto extensor expansions and: Radial sides of proximal phalanges 2 and 3; Ulnar sides of proximal phalanges 3 and 4. Note: digit has two dorsal interossei. • Abducts MP joints of digits 2-4: Reference is line through middle finger.

  44. Interossei Muscles

  45. Palmar Interossei • Four unipennate muscles: First is sometimes considered part of flexor pollicis brevis. Supply each digit except third: Reference is middle finger. • Innervation for all interossei (incl. dorsal): Ulnar nerve

  46. Lumbricals • Four small, narrow, elongated muscles. • Each arises from the radial side of a flexor digitorum profundus tendon. • Innervation: Two on radial side: Median nerve Two on ulnar side: Ulnar nerve • Flex MCP joints and extend IP joints.

  47. Arterial Supply to Hand • Superficial palmar arch: Continuation of ulnar artery. • Deep palmar arch: Continuation of radial artery.

  48. Route of Radial Artery • Smallest terminal branch of brachial artery. • Passes proximally deep to brachioradialis muscle. • Distally the artery lies against the radius lateral to the tendon of the flexor carpi radialis, where it can be felt (radial pulse). • Passes across scaphoid in anatomical snuff box.

  49. Route of Radial Artery • Wraps around the dorsum of first metacarpus: Gives off arteries to the thumb and index finger. • Pierces the first dorsal interosseous muscle and reappears in the palm of the hand. • Gives rise to the deep palmar arch.

  50. Deep Palmar Arch

More Related