Organization of the Lower Limb
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1 Organization of the Lower Limb
2 Limb Development Lower limb develops in an aterolateral position at the level of the L2 to S3 trunk segments Great toe positioned cephalic direction with the soles of the feet in an ateriomedial direction Knee positioned in a posteriolateral position
3 Limb Rotation Lower Limb Rotation Medial rotation Adduction Extension
4 Segments of the Lower Limb Limb Girdle pelvic girdle (gluteal) Free limb -thigh -leg -foot
5 Joints of the Lower Limb
6 Articulation with Axial Skeleton Sacroiliac jt. Sternoclavicular jt,
7 Os Coxae Hemipelvis is composed of the ilium, ischium and pubis with articulation centered in acetabulum Fusion of the 3 bones is complete between 20 and 25 years of age
8 Sacroiliac Joint Auricular articular surfaces
9 Sacroiliac Joint Anterior sacroiliac ligaments Sacroiliac joint Posterior sacroiliac ligaments
10 Joints of the Free Limb Hip Polyaxial ball and socket joint: Felxion/extension Adduction/abduction Medial/lateral rotation
11 Joints of the Free Limb Knee Modified hinge joint Femur Tibia Patella
12 Joints of the Free Limb Ankle (talocrural) joint Hinge joint 1 axis of movement: Dorsiflexion/plantarflexion
13 Joints of the Free Limb Foot Interphalangeal joints: Distal Proximal metatarsophalangeal joints Inversion/eversion occurs at subtalar (talocalcaneal) joint
14 Vasculature of the Lower Limb
15 Superficial Veins Great saphenous v. Small saphenous v.
16 Arterial Blood Supply External Iliac a Internal Iliac a Femoral a Superior gluteal a Inferior gluteal a Popliteal a Obturator a Anterior Posterior tibial a tibial aa dorsalis med/lat pedis plantar a
17 Deep Femoral Artery Medial & lateral femoral circumflex arteries
18 Fascial Compartments
19 Fascia of the Lower Limb Gluteal Fascia Fascia Lata Crural Fascia
20 Fascial Compartments of the Thigh anterior compartment Fascial septa divide limb into compartments medial compartment posterior compartment Anterior compartment Fascia Lata Medial (adductor) compartment Posterior compartment
21 Fascial Compartments of the Leg anterior compartment lateral compartment Anterior crural compartment Lateral crural compartment posterior compartment Posterior crural compartment anterior lateral Superficial & deep posterior crural compartments Crural Fascia posterior
22 Lumbosacral Plexus
23 Innervation of the Lower Limb: Lumbosacral Plexus (L1 - S3)
24 Lumbosacral Plexus L1 - S3
25 Gluteal innervation: Superior gluteal n (L4,5, S1): gluteus medius m. gluteus minimus m. tensor fascia lata Inferior gluteal n (L5, S1,2): gluteus maximus m. N to obturator internus (L5, S1, 2): oburator internus superior gemellus Nerve to quadratus femoris (L4,5, S1): inferior gemellus quadratus femorus
26 Compartmental Innervation Of the Free Limb Anterior compartment Medial compartment Posterior compartment Lateral compartment Thigh Leg Foot
27 Anterior (extensor) compartment of the thigh Innervation: femoral nerve anterior anterior
28 Medial (adductor) compartment of the thigh Innervation: obturator nerve* medial medial *Adductor Magnus innervated by both obturator n and tibial division of sciatic n
29 Posterior compartment of the thigh Hamstring mm: arise from ischial tuberosity & innervated by tibial division of sciatic n. Innervation: Tibial division of sciatic nerve Except short head of biceps femoris: common fibular division of sciatic nerve posterior
30 Posterior compartment of the leg Innervation: tibial n. posterior Superficial posterior crural compartment Deep posterior crural compartment
31 Plantar surface of the foot Innervation: Medial & lateral plantar nerves
32 Innervation of intrinsic muscles of the foot Medial plantar n flexor digitorum brevis flexor hallucis brevis abductor hallucis m 1st lumbrical Lateral plantar n abducator digiti minimi quadratus plantae 2nd, 3rd & 4th lumbricals adductor hallucis Flexor digiti minimi dorsal & plantar interossei
33 Common fibular nerve Nerve supply to the lateral and anterior crural compartments anterior lateral anterior lateral
34 Lateral crural compartment: Superficial fibular nerve Fibularis longus Fibularis brevis lateral
35 Anterior crural compartment: Deep fibular nerve Tibialis anterior m. Extensor hallucis longus m. Extensor digitorum longus m. Fibularis tertius m. anterior
36 Dorsum of the foot: deep fibular nerve Extensor hallucis brevis Extensor digitorum brevis
37 Sensory Innervation of the Lower Limb Key dermatomes thumb - C6 5th digit of hand - C8 nipples - T4 umbilicus - T10 hip crease - L1 great toe - L4 5th toe - S1 *area of skin supplied by a dorsal nerve root
38 Key dermatomes* of the Lower Limb umbilicus - T10 hip crease - L1 great toe - L4 5th toe - S1 *area of skin supplied by a dorsal nerve root
39 Cutaneous Nerve Supply to the Lower Limb
40 References Clemente, C Anatomy: A Regional Atlas of the Human Body, 4th edition. Lippincogtt Williams & Wilkins. Rinabesm C,H, Cunningham s Textbook of Anatomy, 11th edition. Oxford University Press. Rosse, C & Gaddum-Rosse, P Hollinshead s Textbook of Anatomy 5th edition. Lippincott-Raven Schuenke, M et al, 2006 Thieme Atlas of Anatomy: Musculoskeletal System. Thieme. Slaby, F., et al Gross Anatomy in the Practice of Medicine. Lea & Febiger.
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