Are there two occipital condyles?
Are there two occipital condyles?
condylar parts – are located lateral to the foramen magnum and comprise two occipital condyles. Posterior to them are the condylar canals, while the hypoglossal canal also pierces through the condylar part of the occipital bone.
Does atlas articulate with occipital condyles?
Context: The occipital condyles of the skull articulate with the superior articular facets of the atlas vertebra and form an important junction between the cranium and the vertebral column. The morphological features of occipital condyles are relevant in biomechanical, anatomical and clinical studies.
What is the joint between occipital condyles and atlas?
The atlanto-occipital joint on each side is between the occipital condyles and the superior facets on lateral masses of the atlas. The median atlanto-axial joint is a pivot joint between the dens and a ring formed by the anterior arch and transverse ligament of atlas.
What kind of joint is present between the occipital condyles and C1 atlas )?
Synovial ellipsoid joint
Atlantooccipital joint
| Type | Synovial ellipsoid joint; biaxial |
|---|---|
| Articular surfaces | Occipital condyles, superior articular facets of atlas |
| Ligaments | Posterior atlantooccipital ligament, anterior atlantooccipital ligament |
| Innervation | C1 spinal nerve |
| Blood supply | Anastomosis between deep cervical, occipital and vertebral arteries |
How many occipital condyles are there?
occipital condyle A single or paired bony knob that protrudes from the occipital bone of the skull and articulates with the first cervical vertebra (the atlas). In humans there is a pair of occipital condyles, one on each side of the foramen magnum.
Where are occipital condyles?
The occipital condyles are paired kidney-shaped structures that form the base of the occipital bone and are the structural bases for the articulation of the skull with the cervical spine.
Has condyles that articulate with the atlas quizlet?
Bone of the skull that contains the foramen magnum, condyles that articulate with the atlas, and the superior and inferior nuchal lines. Its articulation with the occipital condyles allows the head to nod in a “yes” motion as the occipital condyles rock like a rocking chair on the upper surface of the first vertebra.
How many occipital condyles are present in birds skull?
one occipital condyle
Option A: Birds possess only one occipital condyle also known as monocondylic and so can twirl their skulls upto 270 degrees.
What is occipital condyles?
The occipital condyles are two large protuberances on the undersurface of the occipital bone, located besides the front half of the foramen magnum. It forms the connection between the skull and the vertebral coloumn.
What type of joint is the atlas?
pivot type
The joint between the atlas and axis is a pivot type of joint. It allows the head turn from side to side. It is also called the atloaxoid joint. The ligaments that serve to support and strengthen this joint are called the capsular; anterior and posterior atlantoaxial; and transverse ligaments.
What are the occipital condyles?
Has condyles that articulate with atlas?
The occipital condyles are undersurface protuberances of the occipital bone in vertebrates, which function in articulation with the superior facets of the atlas vertebra.
Where are the condyles on the atlas bone?
On the superior surface of the atlas bone are a pair of concave facets. The facets articulate with rounded condyles on the underside of the skull’s occipital bone. This junction allows the head to nod up and down.
What are the articular surfaces of the occipital condyles?
The articular surfaces of the condyles are convex from before backward and from side to side, and look downward and lateralward. To their margins are attached the capsules of the atlanto-occipital joints, and on the medial side of each is a rough impression or tubercle for the alar ligament.
Where is the atlanto-occipital joint located in the Atlas?
The atlanto-occipital joint on each side is between the occipital condyles and the superior facets on lateral masses of the atlas. (Fig 3.8) This is an ellipsoidal joint supported by the anterior and posterior atlanto-occipital membranes connecting the margins of the foramen magnum to the arches of atlas.
Are there two or more occipital condyles in a dinosaur?
The presence of a single occipital condyle in dinosaurs (including birds) and crocodilians is contrasted with the condition in amphibians and synapsids (including mammals such as Homo sapiens ), where two occipital condyles are present.