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A sagittal crest is a ridge of bone running lengthwise along the midline of the top of the skull (at the sagittal suture) of many mammalian and reptilian skulls, among others. The presence of this ridge of bone indicates that there are exceptionally strong jaw muscles. The sagittal crest serves primarily for attachment of the temporalis muscle ...
In other mammals, the muscle usually spans the dorsal part of the skull all the way up to the medial line. There, it may be attached to a sagittal crest, as can be seen in early hominins such as Paranthropus aethiopicus. The temporalis muscle is covered by the temporal fascia, also known as the temporal
KNM-ER 406, the skull of a Paranthropus, brain volume estimated to 410 cm 3 with a visible sagittal crest and mild or intermediate post-orbital constriction but KNM-ER 37333, the skull of a Homo erectus, brain volume of 850 cm 3 with no visual sagittal crest and an almost not present or reduced post-orbital constriction. [4]
The brow ridge is a nodule or crest of bone situated on the frontal bone of the skull. It forms the separation between the forehead portion itself (the squama frontalis) and the roof of the eye sockets (the pars orbitalis). Normally, in humans, the ridges arch over each eye, offering mechanical protection.
Further, the size of the sagittal crest (and the gluteus muscles) in male western lowland gorillas has been correlated with reproductive success. Balolia et al. extended their interpretation of the crest to the males of Paranthropus species, with the crest and resultantly larger head (at least in P. boisei) being used for some kind of display.
In the middle line is the median sacral crest, surmounted by three or four tubercles—the rudimentary spinous processes of the upper three or four sacral vertebrae. On either side of the median sacral crest is a shallow sacral groove, which gives origin to the multifidus muscle .
For optimal health, he recommends that males aim for 50% skeletal muscle mass relative to total body weight and females target 45% — although other factors, like age and fitness levels, come ...
A crest is any of various anatomical features appearing as a raised point or ridge, most prominently those on the head or back of an animal. A part of a bone: Sagittal crest; Cnemial crest; Iliac crest; Frontal crest; Infratemporal crest; Anterior lacrimal crest; Posterior lacrimal crest; Buccinator crest; A feature on various animals: Crest ...