Do males or females have an occipital protuberance?
The most obvious is generally the superior nuchal line, which may have a large swelling or bump at the center, called the external occipital protuberance. In human males, the markings for these muscles tend to be more pronounced than in females.
Does everyone have external occipital protuberance?
There are still some human populations which often exhibit occipital buns. A greater proportion of early modern Europeans had them, but extremely prominent occipital buns in modern populations are now fairly infrequent, but exist frequently in certain populations.
What is the purpose of the external occipital protuberance?
The external occipital protuberance represents a normal anatomical prominence. However, excessive hornlike prominence is uncommon. Superior nuchal lines run laterally on both sides from external occipital protuberance and provides origin of trapezius muscle in its medial part.
Do females have external occipital protuberance?
The spine type (Type 3) EOP is found to be 63.4% in males and to be 4.2% in females. On the other hand, studies of dry-skull remains revealed the incidence of Type 1 EOP to be 67.5% in females and Type 3 EOP to be 55.2% in males.
Can you tell the difference between a male skull and a female skull?
Generally, male skulls are heavier, the bone is thicker and the areas of muscle attachment are more defined than in females….Summary.
|Smaller and lighter skull||Larger and heavier skull|
|Rounded forehead (frontal bone)||Sloping, less rounded forehead (frontal bone)|
Is there a difference between male and female skulls?
The key difference between male and female skull is that male skull is heavier due to the presence of thicker bones while female skull is lighter due to the presence of thinner bones.
Do men have a bump on the back of their skull?
In addition, each human skull has a natural bump on the back of the head. This bump, called an inion, marks the bottom of the skull where it attaches to the neck muscle.
What is external protuberance?
The external occipital protuberance is a raised area on the midline of the occipital bone where the posterior wall meets the base of the skull. It is at the superior extent of the ligamentum nuchae that connects the cervical vertebrae to the skull.
What is another name for the external occipital protuberance?
The inion (plural: inia/inions) is the tip of the external occipital protuberance (EOP), the midline bony prominence in the occipital bone from which the ligamentum nuchae and trapezius muscle attach.
Are male and female skeletons different?
The male skeleton is heavier and possesses a narrow pelvic cavity, broader shoulders, and long rib cage. On the other hand, the female skeleton is less heavy and possesses a wider pelvic cavity, narrow shoulders, and a shorter rib cage.
What is the external occipital protuberance?
The external occipital protuberance, also referred to as the ” inion ,” is located roughly in the center of this bone. When the muscles, tendons, or ligaments that attach to the ligamentum nuchae become irritated, sufferers may experience neck discomfort.
What is an occipital spur?
Occipital spurs, also called as occipital knob, occipital bun, chignon or inion hook, is an exaggerated external occipital protuberance (EOP). It is frequently discussed in anthropological literature as a Neanderthal trait but hardly reported and considered as a normal variant in medical literature.
What is an occipital spur (type III EOP)?
The measurements on the radiograph showed that the spur had a width of 25.9 mm at its base and stood 13.4 mm above the normal outline of the occipital bone (figure 2). This coincidental radiographic finding was confirmed to be occipital spur (type III EOP). Type III EOP is an unusual finding among females and reported in only 4.2% of them.
What causes osseous proliferation at the posterior occipital region?
Osseous proliferation at the posterior occipital region is related to prominent external occipital protuberance. External occipital protuberance is a midline bony prominence in the occipital bone that ligamentum nuchae and trapezius muscle attach to its tip. The tentorium cerebelli attaches to its internal surface.