Class # 10 The Hand

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princessmagonda
ID:
91770
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Class # 10 The Hand
Updated:
2011-06-25 13:00:47
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Class Hand
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Class # 10 The Hand
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  1. Joint: Carpometacarpal Joint (CMC)
    What bones of the hand does the joint articulate?
    What kind of a joint is it?
    What is a characteristic of the 2nd & 3rd?
    What is a characterisitic of the 4th & 5th?
    • The joint articulates carpals and metacarpals.
    • It's a plane synovial joint.
    • 2nd & 3rd are stable
    • 4th & 5th are more mobile
  2. Joint: metacarpophalangeal Joints (MCP)
    What bones of the hand does the joint articulate?
    Characteristics?
    Action?
    • Articulation: metacarpals and proximal phalanges
    • Characteristics: condyloid; biconvex --> concave medial to lateral, anterior to posterior
    • Action: extension & flexion (saggital; spread fingers out) adduction & abduction (coronal)
  3. Joint: Proximal interphalangeal Joints (PIP)
    What bones of the hand does the joint articulate?
    What kind of joint is it?
    Action?
    • Articulation: proximal phalanges and middle phalanges
    • Joint: It's a hinge joint
    • Action: flexion & extension
  4. Joint: Distal interphalangeal Joints (DIP)
    What bones of the hand does the joint articulate?
    What kind of joint is it?
    Action?
    • Articulation:middle phalanges and distal phalanges
    • Joint: It's a hinge joint.
    • Action: Flexion and extension
  5. Muscle: Oppenens Pollicis (Thenar compart.; intrinsic; OAF; deepest)
    Origin?
    Insertion?
    Innervation?
    Action?
    • Origin: flexor retinaculum & tubercles of scaphoid &trapezium
    • Insertion: lateral side of 1st metacarpal
    • Innervation: recurrent motor branch of median nerve (C8-T1) except for the deep head of FPB.
    • Action: oppose thumb, it draws 1st metacarpal medially to center of palm and rotates it medially
  6. Muscle: Abbductor pollicis brevis (Thenar compart.; intrinsic; OAF; lateral)
    Origin?
    Insertion?
    Innervation?
    Action?
    • Origin: flexor retinaculum & tubercles of scaphoid & trapezium
    • Insertion: lat. side of base of proximal phalanx of thumb
    • Innervation: recurrent motor branch of median nerve (C8-T1) except for the deep head of FPB.
    • Action: abducts thumb; helps oppose it
  7. Muscle: Flexor pollicics brevis (Thenar comart.; intrinsic; OAF; medial)
    Origin?
    Insertion?
    Innervation?
    Action?
    • Origin: flexor retinaculum and tubercles of scaphoid and trapezium
    • insertion: lat side of base of thumb proximal phalanx of thumb
    • innervation: recurrent branch of median nerve (C8, T1)
    • action: flexes thumb
  8. Muscle: Opponens digiti minimi (hypothenar compart.; intrinsic; OAF; deep)
    Origin?
    Insertion?
    Innervation?
    Action?
    • Origin: hook of the hamate & flexor retinaculum
    • Insertion: medial border of 5th metacarpal
    • Innervation: deep ulnar nerve (C8-T1)
    • Action: draws 5th metacarpal ant. & rotates it, bringing 5th finger into opposition w/thumb
  9. Muscle: Abductor digiti minimi (hypothenar compart.; intrinsic; OAF; most superficial)
    Origin?
    Insertion?
    Innervation?
    Action?
    • Origin: pisoform
    • Insertion: medial side of base of proximal phalanx of 5th finger
    • Innervation: deep ulnar nerve (C8-T1)
    • Action: abducts 5th finger; assits in flexion of its proximal phalanx
  10. Muscle: Flexor digiti minimi brevis (hypothenar compart.; intrinsic; OAF; middle)
    Origin?
    Insertion?
    Innervation?
    Action?
    • Origin: hook of the hamate & flexor retinaculum
    • Insertion: medial side of base of proximal phalanx of 5th finger
    • Innervation: deep ulnar nerve (C8-T1)
    • Action: flexes proximal phalanx of 5th finger
  11. Muscle: Lumbricals (central compart.)
    How many and where?
    origin?
    insertion?
    innervation?
    action?
    • four; only on palmer
    • origin: flexor digitorium profundus
    • insertion: lat sides of extensor expansions of 2nd-5th fingers
    • innervation: half median (C8, T1), half ulnar (C8, T1)
    • action: flex MCP (metacarpophalangeal) joints and IP (interphalangeal) joints; extension of PIP and DIP joints
  12. Muscle: interossei (interosseous compart.)
    How many on dorsal and palmer?
    Origin?
    Insertion?
    Innervation?
    Action?
    • 4 dorsal; 3 palmer
    • origin:
    • dorsal: adj sides of 2 metacarpals
    • palmer: 2nd, 4th, & 5th metacarpals
    • insertion:
    • dorsal: bases of proximal phalanges; extensor
    • expansions of 2-4th fingers
    • palmer: bases of proximal phalanges; extensor
    • expansions of 2nd, 4th, & 5th fingers
    • innervation: deep branch of the ulnar nerve (C8-T1)
    • action: assist lumbricals in flexing MP's & extending IPs. extends PIP and DIP joints.
  13. Muscle: Adductor pollicis (not a thenar muscle; adductor compart.)
    origin?
    insertion?
    innervation?
    action?
    • Origin:oblique head: bases of 2nd & 3rd metacarpals, capitate, adj. carpalstransverse head: ant. surface of shaft of 3rdmetacarpal
    • Insertion: medial side of base of proximal phalanx of thumb
    • Innervation: deep branch of ulnar nerve (C8, T1)
    • Action: adducts thumb toward lat. border of palm

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