Anatomy - Lower limb Flashcards
Dermatomes of lower leg
L1-S1
L1 groin
L2 upper thigh
L3 Upper thigh obliquely to inner upper lower leg
L4 Mid way down upper out thigh down to side lower leg to big toe
L5 Outer lower leg to inner toes 2-4
S1 Little toe
Superficial cutaneous arteries of the anterior thigh come from
the femoral artery
The great saphenous vein arises from
medial end of dorsal venous arch on the foot
The great saphenous vein surface landmarks (3)
Anterior to medial malleolus
Posterior to patella anterior to medial epicondyle
Ascends anteromedial thigh
Great saphenous vein drains into
Femoral vein at the saphenous opening
Tributaries of great saphenous vein (7)
Ankle - medial marginal vein
Lower leg - anterior and posterior tibial veins
Thigh - accessory saphenous vein
Near the saphenous opening - superficial epigastric, superficial iliac circumflex, superficial external pudendal veins
Superficial Longitudinal lymph nodes
Lie along the saphenous vein
Drain superficial tissues of lower limb
Superficial Horizontal lymph nodes
Lie parallel to inguinal ligament
Drain from superficial tissues of lower trunk below umbilicus, buttock, external genitalia and lower half of anal canal
Deep lymph nodes
Medial to femoral vein
Drain all tissues deep to fascia lata of lower limb and superficial tissues and skin from heel and lateral aspect of the foot
Actions of sartorius (5)
Flexion of hip Abduction of the hip Lateral rotation of the hip Flexion of the knee Sitting cross legged
Nerve supply of sartorius
L2-L3 Femoral nerve
Action of Iliacus (1)
Flexion of the hip
Nerve supply of illiacus
L2 Femoral nerve
Action of Psoas major (2)
Flexion of hip
Postural muscle controlling trunk while standing
Nerve supply of Psoas major
L1-L3 Femoral nerve
Action of pectineus (2)
Adduction of the hip
Flexion of the hip
Nerve supply of pectineus
L2-L3 Femoral nerve, Obturator nerve
Action of (3) Quadriceps femoris Rectus femoris Vastus lateralis Vastus medialis Vastus intermedius
Extension of knee
Stabilisation of knee
Rectus weakly stabilises the hip
Nerve supply of Quadriceps femoris Rectus femoris Vastus lateralis Vastus medialis Vastus intermedius
L2-L4 Femoral nerve
The femoral sheath is a prolongation of
extraperitoneal fascia
Surface markings of femoral sheath
Funnel shaped tube emerging from behind the inguinal ligament, ending 4cm inferiorly. Contains the femoral artery and vein, not the nerve
The femoral canal
is a short conical medial compartment of the femoral sheath that lies between the medial edge of the femoral sheath and the femoral vein. The space allows for femoral vein expansio with increased venous return from the leg
The femoral ring
is a 1cm opening at the abdominal end of the femoral canal
The femoral artery is a continuation of
the external iliac artery
The femoral artery starts at
the mid-inguinal point behind the inguinal ligament
The femoral vein lies
medially to the femoral artery in the groin
The femoral nerve is derived from
the posterior divisions of L2-L4
Surface markings of the femoral nerve
Passes under the inguinal ligament lateral to the femoral artery. 5cm below the ligament it divides into superficial and deep branches
The superficial branch of the femoral nerve splits into 4 branches
Medial cutaneous branch - supplies skin over medial thigh
Intermediate cutaneous branch - supplies skin over anterior thigh
2 muscular branches - pectineus and sartorius
The deep branch of the femoral nerve splits into 5 branches
4 muscular branches - quadriceps femoris
Saphenous nerve descending below the knee to supply skin over medial aspect of leg and foot
The patella ligament is a continuation of
The quadriceps tendon, formed from the 4 parts of quadriceps
The petella bone type
Sesamoid bone
Lateral patellar draw is prevented by
Medial patella ligament and vastus medialis
3 prime hip adductors
Adductor longus
Adductor brevis
Adductor magnus
Nerve supply of Adductor longus, brevis and magnus
L2-4 Obturator nerve
Action of obturator externus
Lateral rotation of hip
Nerve supply of obturator externus
L3-4 Obturator nerve
Main artery of the thigh and it’s main support
Profunda femoris - from femoral artery.
Supported by obturator artery
Obturator nerve supplies
Muscles - Adducotr longus Adductor brevis Adductor magnus Gracilis Obturator externus Pectineus Cutaneous - Skin of medial thigh
Cutaneous innervation of hip and glutes is from
Posterior and anterior rami of lumbosacral nerves L4-S5
Action of gluteus maximus (2)
Extension of the hip
Lateral rotation of the hip
Nerve supply of gluteus maximus
L5-S2 Inferior gluteal nerve
Action of gluteus medius and gluteus minimus (3)
Abduction of hip
Medial rotation of the hip
Prevents pelvis tilting to unsupported side when walking
Nerve supply of gluteus medius and gluteus minimus
L5-S1 Superior gluteal nerve
Action of piriformis
Lateral rotation of hip
Nerve supply of piriformis
Branches of ventral rami of S1-2 from sacral plexus
Which muscles work synergistically as femoral lateral rotators and hip stabilisers (3)
Piriformis
Obturator internus
Quadratus femoris
Sciatic nerve originates from
Anterior primary rami of sacral plexus L4-S3
Landmarks of sciatic nerve
Leaves the pelvis throught the greater sciatic foramen and descends int he midline deep to gluteus maximus.
Divides into terminal branches tibial nerve and common peroneal nerve in mid-thigh
Safe IM injections in the buttock can be made in the
Superolateral quarter
Midpoint between spinal column and midaxillary line
Midpoint between iliac crest and greater trochanter
The bony acetabulum consists of (3)
Ileum (superior)
Ischium (postero-inferior)
Pubis (anterior)
Hip joint ligaments - Transverse ligament
Forms inferior margin
Hip joint ligaments - Ligamentum teres
Weakly attaches the floor of the acetabulum to the femoral head
Hip joint ligaments - provides main stability (3)
Iliofemoral ligament
Pubofemoral ligament
Ischiofemoral ligament
Blood supply of the hip joint comes from
Circumflex femoral artery
Nerve supply of hip joint (3)
Branches of femoral, sciatic and obturator nerve
Hip movements - Flexion (5)
0-120 Iliacus Psoas major (rectus femoris) (sartorius) (pectineus)
Hip movement - Extension (4)
0-20
Gluteus maximus
Hamstrings - Biceps femoris, Semimembranosus, Semitendinosis
Hip movements - Adduction (5)
0-30 Adductor magnus Adductor longus Adductor brevis (Gracilis) (Pectineus)
Hip movements - Abduction (3)
0-45
Gluteus medius
Gluteus minimus
Tensor fascia latae
Hip movements - External rotation (7)
0-45 Piriformis Obturator internus Obturator externus Gemellus inferior Gemellus superior Quadratus femoris Gluteus maximus
Hip movements - Internal rotation (3)
0-45
Tensor fascia latae
Gluteus medius
Gluteus minimus
Actions of Biceps femoris (2)
Extension of hip
Flexion of knee
Innervation of Biceps femoris
L5-S2 Sciatic nerve
Action of semitendinosus (2)
Extension of hip
Flexion of knee
Nerve supply of semitendinosus
L5-S2 Sciatic nerve