Dictionary > Foramen magnum

Foramen magnum

Definition
noun
A large opening in the anterior inferior portion of occipital bone in the cranium that serves an outlet of the spinal cord and medulla to enter from the skull to the vertebral column.
Supplement
Foramen magnum is one of the largest openings or canals situated at the base of the skull to permit the route of blood vessels, nerves, cerebrospinal fluid and connective tissue into and out of the brain. It also covey the spinal component of the accessory nerve into the cranial fossa and transmits the anterior and posterior spinal arteries, vertebral arteries and alar ligaments.
The foramen magnum in humans are exceptional compare to other mammals since it is frontward in the occipital bone from the back of the skull beneath the center mass of the skull and brain, thus neck muscles of humans need not to be as tough in order to hold the head upright. Unlike in quadriped mammals in order to create better balance the neck bones and muscles are proportionately smaller. On the other hand, head and brains in humans are relatively larger compare to the upper cervical spine, as consequent human are susceptible to slip and fall kinds of injuries.
Word Origin: foramen= “hole” + magnum= “large
Synonym: great foramen
See also:
• cranial bone
• posterior cranial fossa


You will also like...

Angle Oak Tree
Seed Plants

Seed plants are vascular plants. They differ from the other vascular plants in producing seeds that germinate into a new..

Genetics – Lesson Outline & Worksheets
Genetics – Lesson Outline & Worksheets

  Topics Modules Quizzes/Worksheets Description Introduction to Genetics Genetics – Definition: Heredity and ..

Lentic community
Freshwater Communities & Lentic Waters

Lentic or still water communities can vary greatly in appearance -- from a small temporary puddle to a large lake. The s..

A sperm cell fertilizing an ovum
Human Reproduction and Fertilization

For human species to obviate extinction, reproductive mature adults should be producing viable offspring in order to con..

sponge
Primitive Animals

Life, as we know it today, is presumed to have started in the sea and many of them were likely eukaryotic animal-like or..

Human Reproduction
Human Reproduction

Humans are capable of only one mode of reproduction, i.e. sexual reproduction. Haploid sex cells (gametes) are produced ..

Related Articles...

No related articles found

See all Related Topics