Chapter 20 Lower Limb Development Flashcards Preview

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Flashcards in Chapter 20 Lower Limb Development Deck (17):

Which aa gives rise to the axis aa of the lower limb?

The umbilical aa


The axis aa gives rise to the a_______ t________ ----> d________ p______, and the p_______ t_______ --------> m______ p________ and l_________ p________

Anterior tibial -------> dorsalis pedis
Posterior tibial -------> medial plantar, lateral plantar


The axis persists in the adult as the inf. g________, s_______, proximal p__________ and distal p_______

Inf. gluteal, sciatic, proximal popliteal and distal peroneal.


The external iliac------> f________ aa which --------> p_______ f_______ aa.

Femoral, profundus femoris.


The lower limb bud grows opposite somites L___ through S_____

L1 - 5, S1 - 2


Mesoderm from the somites a.k.a. m_________ migrates in the lower limb during week ___

Myotomes, 5


The posterior condensation of the lower limb gives rise to e_________ muscles and muscles of a__________.

Extensor, abduction


The anterior condensation of the lower limb gives rise to f__________ muscles and muscles of a_________

Flexor, adduction


Name the four major branches of the posterior division of the lumbosacral plexus.

Sup. gluteal, inf. gluteal, femoral, and common peroneal nerves.


Name the spinal column levels that give rise to the following nerves: sup. gluteal, inf. gluteal, femoral, common peroneal.

Sup. gluteal - L4, L5, S1
Inf. gluteal - L5, S1, S2
Femoral - L2-4
Common peroneal - L4, L5, S1, S2


Name the two major branches of the merged anterior division of the lumbosacral plexus.

Tibial and obturator nerves.


Name the spinal cord levels that contribute to the tibial and obturator nerves.

Tibial - L4, L5, S1-3
Obturator - L2-4


The lower limb rotate ____ degrees __________ during development.

90 degrees, medially


Lower limb rotation occurs during weeks ___ through ___.

6 through 8


Name the major events that occur in bone formation during weeks 5, 6, and weeks 7-9.

5 - condensation
6 - formation of the hyaline cartilage model of the bone
7-9 - formation of the primary ossification center at the center of the diaphyses


Which bones of the LE develop primary ossification centers first?

Illium, ischium, pubis, fibula, calcaneus, talus, metatarsals, phalanges.


The epiphyseal end of the femur at birth is composed of ___________.

Cartilage. The bone has not yet been fully ossified.