Romer (1927), studying the development of the thigh musculature in chick embryos, concluded that the entire obturator complex is homologous with the mammalian obturator externus plus quadratus femoris.
The use of the term obturator externus for the entire complex is avoided because it may not correspond exactly to the mammalian obturator externus.
Their obturator externus lies anterior and deep to the extrapelvic part of the obturator internus and inserts separately from the latter.
The only notable difference in configuration is that the part in Coccyzus that appears to correspond to the obturator externus of Hudson, et al.
Fisher and Goodman (1955) apply the name femoritibialis externus to the muscle unit that I here term the pars postica of M.
Their term femoritibialis externus is not used here; the muscle so named is considered to be a part of M.
The ventral part of the obturator externus of Berger represents the fused pars antica and pars ventralis.
It appears to me that the dorsal part and a part of the ventral part of the obturator externus of Berger correspond to the extrapelvic fleshy part of the obturator internus of Hudson, et al.
As mentioned previously, Romer considers the avian muscle to be homologous not only with the mammalian obturator externus but also with the quadratus femoris.
Hudson is homologous with the obturator externus of mammals.
The meatus auditorius externus is formed at the region of a shallow depression where the closure of the first visceral cleft takes place.
The tympanic membrane is derived from the tissue which separates the meatus auditorius externus from the tympanic cavity.
Slightly posterior to the anterior end of the cavum medium the foramen for the ramus externus narium (r.
It appears slightly anterior to the septomaxillary at the level of the foramen ramus externus narium and ramus medialis narium.
It covers the rectus and vastus externus portions of the triceps cruris; it is also in relation with the gluteal muscles.
It is covered in front by the tensor of the fascia lata, and contributes with the vastus externus to form the upper prominence of the knee.
Furthermore, as in the case of the latter, the vastus externus and the vastus internus take their origin from the shaft of the femur, while the long portion arises from the pelvis.
In the dog and the cat the vastus externus is the most voluminous of the three portions which constitute the triceps muscle.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "externus" in a variety of sentences. We hope that you will now be able to make sentences using this word.
