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Ridge and crest refer to a long, narrow line. [10] Unlike many words used to describe anatomical terms, the word ridge is derived from Old English. [11] [b] A spine, as well as referring to the spinal cord, may be used to describe a relatively long, thin projection or bump.
A strike ridge is an asymmetric ridge created by the differential erosion of a hard, erosion-resistant, dipping layer of rock sandwiched between layers of weaker, more easily eroded rock. A strike ridge has a distinctly gentler sloping side (dip slope), that roughly parallels the inclined layer of erosion-resistant rock.
Some paleoanthropologists distinguish between frontal torus and supraorbital ridge. [2] In anatomy, a torus is a projecting shelf of bone that unlike a ridge is rectilinear, unbroken and goes through glabella. [3] Some fossil hominins, in this use of the word, have the frontal torus, [4] but almost all modern humans only have the ridge. [5]
The perineal raphe is a visible line or ridge of tissue on the body that extends from the anus through the perineum to the scrotum (male) or the vulva (female). It is found in both males and females, arises from the fusion of the urogenital folds, and is visible running medial through anteroposterior, to the anus where it resolves in a small knot of skin of varying size.
The linea aspera is a prominent longitudinal ridge or crest, on the middle third of the bone, presenting a medial and a lateral lip, and a narrow rough, intermediate line. It is an important insertion point for the adductors and the lateral and medial intermuscular septa that divides the thigh into three compartments. The tension generated by ...
The carina is a cartilaginous ridge separating the left and right main bronchi that is formed by the inferior-ward and posterior-ward prolongation of the inferior-most tracheal cartilage. [ 2 ] The carina occurs at the lower end of the trachea - usually at the level of the 4th to 5th thoracic vertebra .
A mammary ridge, or crest, usually stops growing at eight weeks and its length is regressed starting at the caudal end and extending cranially, [1] so that what remains is a round, ectodermic placode where the axilla develops. When shortening of the mammary crest is complete, the structure remains prominent in the areas where the mammary glands ...
The appearance and presence of vaginal rugae change over the life span of females and are associated with hormonal cycles, estrogens, childbirth, puberty and menopause.. During gynecological examination of prepubescent girls, rugae can be visualized.