the lower limbfac.ksu.edu.sa/sites/default/files/anatomy_lecture-2.pdf · • dermatome: may...
TRANSCRIPT
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The Lower Limb
AnatomyRHS 241Lecture 2
Dr. Einas Al-Eisa
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The bony pelvis
• Protective osseofibrous ring for the pelvic viscera
• Transfer of forces to: – acetabulum & head of femur (when standing)– ischial tuberosities (when sitting)
• Large surface area for the attachment of muscles
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The bony pelvis
Orientation
• When in the anatomical position: the ASIS and pubic symphysis lie within the same vertical line
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Articulations
• Anteriorly: Pubic symphysis
• Posteriorly: sacroiliac joints
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What are the primary functions of the sacroiliac joints when in the
anatomical position?
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Innominate bone
Ilium Ischium Pubis
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Where (i.e., in which region approximately) does fusion of the
three components of an innominate bone occur to form a single bone as seen in adults?
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Pelvis: lateral view
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Ilium
• Iliac crest• Anterior superior iliac spine (ASIS)• Anterior inferior iliac spine• Posterior superior iliac spine (PSIS)• Auricular surface (articular surface of SIJ)• Supracristal line: joins the highest points
of the iliac crests (to locate the position the spinous process of L4)
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Pubis
• Body • Pubic crest (superior margin of the body)
• Pubic tubercles (prominent lateral eminence of pubic crest)
• Superior & inferior rami (project laterally from the body)
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Ischium
• Ischial tuberosity
• Greater sciatic notch (superior to the iliac spine)
• Lesser sciatic notch (inferior to the iliac spine)
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Pelvis: medial view
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Femur
• Long bone:Shaft (diaphysis)Enlarged proximal & distal ends (epiphysis)
• Angle of obliquity: in the anatomical position, the distal ends are closer to midline than proximal ends (more in females)
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Long Bones
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Femur- proximal end
• Head: articulates with acetabulum (hip J)
• Pit (fovea of head): attachment of a ligament
• Neck: directed laterally, downward, & posteriorly (common site of fractures)
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Right femur
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Femur- proximal end
• Greater trochanter: attachment of muscles• Lesser trochanter: attachment of muscles
• Intertrochanteric line: anterior at the junction of the neck & shaft
• Intertrochanteric crest: prominent; posterior at the junction of the neck & shaft
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Femur- shaft
• Linea aspera: posterior (roughened by the attachment of thigh muscles)
• Popliteal surface: posterior
• Supraconylar lines: medially & laterally
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Right femur
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Femur- distal end
• Why is the distal end of femur enlarged?
• Medial & lateral condyles: articulate with the tibia (knee joint)
• Intercondylar notch (fossa): posterior
• Patellar surface: anterior (articulates with the patella to for the femoropatellar joint)
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Hip joint
• Synovial• Ball & socket (multiaxial)
• Articular sufaces:Head of femurLunate surface of acetabulum (U-shaped)Acetabular labrum: complete ring of fibrocartilage
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What function is served by the acetabular labrum?
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Ligaments
• Capsular ligaments of the hip are strong and taut (particularly in the extended position)
• The joint is most vulnerable to dislocationwhen in flexion and external rotation (e.g., sitting in a car)
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Ligaments
• Iliofemoral: anterior two bands of fibers (medial & lateral)known clinically as the ‘Y’ ligament of Bigelow ASIS to intertrochanteric line prevent overextension of hip
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Ligaments
• Pubofemoral:anterior & inferiorextends laterally from the pubic bone to the intertrochanteric line prevent over-abduction
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Hip Joint: Anterior View
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Ligaments
• Ischiofemoral:posteriorfrom the ischium, arches forward over the neck of the femur attaches anteriorly to the intertrochanteric line prevent hyperextension of hip
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Hip Joint: Posterior View
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Ligaments
• Transverse ligament of the acetabulum:inferior bridges the ends (horns) of the lunate articularsurface
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Ligaments
• Ligament of the head of femur:Carries a blood vessel to the femoral head Attached to the pit (fovea) of the femur
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Gluteal region
• Sciatic nerve enters the gluteal region near the midpoint of a line joining the PSIS & ischial tuberosity
• Common site for intramuscular injections: upper lateral quadrant (to avoid damage to the sciatic nerve)
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Sacral Plexus
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Routes for neurovascular structures from the pelvis to gluteal region & thigh
= osseofibrous spaces or holes through which nerves and blood vessels enter and leave the thigh from the pelvis
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Routes for neurovascular structures
• Inguinal route: formed by the inguinal ligament and the innominate bone (anterior)
• Obturator route: the opening or canal within the obturator membrane
• Gluteal route: osseofibrous ring formed by the greater sciatic notch and accessory ligaments of the SIJc
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Muscles of the gluteal region
• Gluteus maximus: inferior gluteal nerve extension & lateral rotation
• Gluteus medius: superior gluteal nerve abduction
• Gluteus minimus: superior gluteal nerve
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Gluteal Region & Posterior thigh
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Muscles of the gluteal region
• Gluteus medius & minimus: chief abductors (on a free limb)
• During walking, they contract on the weight-bearing side to prevent the pelvis on the non-weight-bearing side from dropping
• Trendlenburg gait?
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When standing on booth feet and shifting your weight from one limb
to the other, on which side are the gluteus medius & minimus
contracting?
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Short lateral rotators of the thigh
• Piriformis (anterior surface of sacrum to greater trochanter)
• Obturator internus (to greater trochanter)• Obturator externus (to greater trochanter)
• The gemelli muscles (superior & inferior)• Quadratus femoris (ischial tuberosity to
intertrochanteric crest)
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Gluteal Region
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Gluteal Region: Deep
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Short lateral rotators of the thigh
• Common function: assist lateral rotation of the femur
• Oriented like the fascicles of the gluteus maximus
• Most of those muscles lie posterior to the neck of the femur
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What is the strongest lateral rotator of the thigh?
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Structure of spinal nerves
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Spinal nerves
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Sacral Plexus
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Spinal cord & Nerve roots
• Dermatome = the area of skin supplied by a single nerve root
• Myotome = group of muscles supplied by a single nerve root
• Sclerotome = an area of bone or fascia supplied by a single nerve root
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Neurological testing
• Dermatome: may exhibit sensory changes for light touch and pin prick
• Myotome: assessed by performing isometric resisted tests held for 3-5 seconds (L1-L2: hip flexion, L3: knee extension, L4: ankle dorsiflexion & inversion, L5: extension of big toe, S1-S2: plantar flexion & knee flexion, S3-S4: muscles of the pelvic floor & bladder)
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Neurological testing
• Reflexes:
• The qudriceps reflex L3
• The achilles tendon reflex S1
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Referred Pain
• Pain felt in a part of the body that is usually far from the tissue that have caused it.
• May be due to misinterpretation by the brain as to the source of the painful stimulus.
• Indicates that one of the structures innervated by a nerve root is causing signs & symptoms in other tissues supplied by that same nerve root.
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Radiating (radicular) Pain
= Pain felt in a dermatome, myotome, or sclerotome because of direct involvement of a spinal nerve root.