LOWER APPENDICULAR SKELETON 11/3/81,11/5/81 rvsd 11/7/96, 1 Nov 00, 31 Oct 01, 9 Nov 01, 5 Nov 03, 26 O ct 05, 29 Oct 07, 3Nov08, 20Feb13 Martini’s 5th : 234-242, Martini 6th : 249-257, 7th : 245-255, 8th : 247-264, 9th : 240-248 Pelv ic Girdle forme d from os co xae (hip bo ne) articulate with sacrum (sac roiliac joint) OS COXA (p 241) in emb ryo formed from three bones, ilium, isch ium a nd p ubis acetabulum (vinega r cruet): where ilium, ischium and pubis meet, articulate w ith femur. obturator foramen 1arge hole below acetabulum Ilium: iliac crest lateral top of “hip” iliac fossa (smooth inner concave surface) anterior superior iliac spine hard bo ny lateral anterior points arcuate line (bow shap ed) lo wer portion of iliac fossa, greater sciatic notch Ischium (Gk for hip) posterior inferior portion of os coxa, part of acetabulum greater ischial spine below sciatic notch ischial tuberosity supports weight when sitting ischial ramus arches to meet pubic ramus (branch) Pubis: superior ramus forms pub ic symphy sis (growing together) inferior ramus joins with ischial ramus Pelvic ca vities: false (greater) and true (lesser, below pelvic brim) pelvic brim sacral prom ontory, upp er margin symphysis-arcuate lines false p elvis surrounde d by iliac fossa, ab dom inal wall true pelvis surrounded by bone: ilium, ischium, pubis, sacrum, coccyx. top is the inlet, bottom is the outlet p 24 2: M ale P elvis Fem ale P elvis (p 243) pubic angle acu te pubic angle obtuse narrow ischial tuberosities wider ischial tuberosities massive delicate narrow iliac spines wide iliac spines heart shaped inlet large circular inlet oval obturator foreman triangular obturator foreman acetabulum faces laterally acetabulum faces more anterior curved ilium wing straight ilium wing FEMUR (thigh): longest bone in body 244 head neck greater and lesser trochantors linea aspera (rough line) medial and lateral condyles add ucto r tub ercle PAT ELL A: sesam oid b one, forms w ithin TIBIA: medial and lateral condyles 246 intercondylar eminence tibial tuberosity anterior crest medial malleolus FIBULA: 246 head lateral malleolus: ANKLE: seven tarsal bones: 247 talus calcan eus cubiod navicular medial cuneiform intermediate cuneiform lateral cuneiform spherical proximal epip hysis: fovea ca pitis, tied by ligamentum teres to acetabulum then two pro cesses: (insertions: greater: gluteus minimus and medius; lesser: iliopsoas). posterior line widens into popliteal surface distally at distal end, separated by intercon dylar f o ssa medially fr distal end tendon, protects, impro ves leve rage o f quadriceps femoris at proximal end or spine site of attachment of ligamentum patellae sharp ness of shin projects down medially, inner lump of ankle. articulates with lateral cond yle of tibia outer lump of ankle articulates via troc hlea with tibia and fibula, between malleoli heel bone, attachment for several calf muscles articulates laterally with calcaneus, anteriorly with forth & fifth metatarsals articulates medially with calcaneus, distally with cuneiform first metatarsal second metatarsal third metatarsal (adjacent to cuboid) TO ES: 247 three cuneiforms articulate with first three metatarsals: I, II, III cuboid with last two metatarsals: IV, V. PHALAN GES as in hand: 2nd-5th have proximal, middle, distal phalang es. 1st has no medial. Arches: supported mainly b y ligaments longitud inal arch: from calcaneus to metatarsals and tarsals, m portion greater than lateral (calcaneal). transverse forms acro ss at base of metatarsals Sesamoid bones: form in tendons subject to c omp ression , therefore usually around joints. Patella is largest. also around metac arpo phalangea l and metatarso phalangea l joints