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- n. tubercle
from the GNU version of the Collaborative International Dictionary of English
- n. A tubercle.
from The Century Dictionary and Cyclopedia
- n. A little tuber; a small tuberosity.
- n. In pathology:
- n. A hard, circumscribed, rounded elevation of small size on the surface of the body or an organ.
- n. A nodule, of varying size, composed chiefly of granulation-cells: the characteristic lesion of tuberculosis.
Sorry, no etymologies found.
The thyroid gland is developed from a median diverticulum (Fig. 1175), which appears about the fourth week on the summit of the tuberculum impar, but later is found in the furrow immediately behind the tuberculum (Fig. 979).
The intervenous tubercle (tuberculum intervenosum; tubercle of Lower) is a small projection on the posterior wall of the atrium, above the fossa ovalis.
The tuberculum impar is said to form the central part of the tongue immediately in front of the foramen cecum, but Hammar insists that it is purely a transitory structure and forms no part of the adult tongue.
This elevation was named by His the furcula, and is at first separated from the tuberculum impar by a depression, but later by a ridge, the copula, formed by the forward growth and fusion of the ventral ends of the second and third arches.
During the third week there appears, immediately behind the ventral ends of the two halves of the mandibular arch, a rounded swelling named the tuberculum impar, which was described by His as undergoing enlargement to form the buccal part of the tongue.
Lateral to the foveæ is a rounded elevation named the area acustica, which extends into the lateral recess and there forms a feebly marked swelling, the tuberculum acusticum.
The nucleus of the cochlear nerve consists of: (a) the lateral cochlear nucleus, corresponding to the tuberculum acusticum on the dorso-lateral surface of the inferior peduncle; and (b) the ventral or accessory cochlear nucleus, placed between the two divisions of the nerve, on the ventral aspect of the inferior peduncle.
Efferent fibers of tuberculum acusticum, forming the striae medullares, with 6, their direct bundle going to the superior olivary nucleus of the same side; 6, their decussating bundles going to the superior olivary nucleus of the opposite side.
Until the seventh or eighth month of fetal life the body of the sphenoid consists of two parts, viz., one in front of the tuberculum sellæ, the presphenoid, with which the small wings are continuous; the other, comprising the sella turcica and dorsum sellæ, the postsphenoid, with which are associated the great wings, and pterygoid processes.
Behind the chiasmatic groove is an elevation, the tuberculum sellæ; and still more posteriorly, a deep depression, the sella turcica, the deepest part of which lodges the hypophysis cerebri and is known as the fossa hypophyseos.