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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
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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)
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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.
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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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