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The foramen magnum varies in size between individuals. Earlier ossification of the occipital bone leads to a smaller foramen. [5] The foramen magnum varies in size and shape when comparing different populations to each other. In humans, men tend to have a larger sized foramen magnum than women, but the overall shape is consistent. [6]
The foramen magnum (Latin: large hole) is a large oval foramen longest front to back; it is wider behind than in front where it is encroached upon by the occipital condyles. The clivus, a smooth bony section, travels upwards on the front surface of the foramen, and the median internal occipital crest travels behind it. [3]
Intervertebral foramen, foramina formed between vertebrae. Lesser sciatic foramen, an opening between the pelvis and the posterior thigh. Obturator foramen, the opening created by the ischium and pubis bones of the pelvis. Vertebral foramen, the foramen formed by the anterior segment (the body), and the posterior part, the vertebral arch.
The brow ridges are often not well expressed in human females, as pictured above in a female skull, and are most easily seen in profile. The brow ridge, or supraorbital ridge known as superciliary arch in medicine, is a bony ridge located above the eye sockets of all primates and some other animals.
The Posterior cranial fossa is colored in blue, yellow, and red. The posterior cranial fossa is the part of the cranial cavity located between the foramen magnum, and tentorium cerebelli. It is formed by the sphenoid bones, temporal bones, and occipital bone. It lodges the cerebellum, and parts of the brainstem.
The foramen magnum is located inferiorly under the skull, which puts much of the weight of the head behind the spine. The flat human face helps to maintain balance on the occipital condyles . Because of this, the erect position of the head is possible without the prominent supraorbital ridges and the strong muscular attachments found in, for ...
Squamous part of occipital bone. Human skull seen from above (parietal bones removed). Squamous part is shown in red. Occipital bone at birth, seen from below. (Squamous part is top half, portion above foramen magnum, shown in yellow.) The squamous part of occipital bone is situated above and behind the foramen magnum, and is curved from above ...
The skull was an indicator of orthograde posture because of the location and orientation of the foramen magnum. The foramen magnum is the space in the skull that acts as the bridge to the central nervous system from the spinal cord to the brain. For animals with "pronograde posture, the foramen magnum is dorsally oriented, whereas in humans it ...