Changes

1st cervical vertebrae,atypical vertebrae.

1st cervical vertebrae,atypical vertebrae.

Known as atlas because in humans it holds the round head.

Known as atlas because in humans it holds the round head.

Consists of a large neural ring,a bodyand two wings.

Consists of a large neural ring,a body and two wings.

Wings are bony plate and projects laterally.supraspinous process is absent or, may be in the form of a tubercle.

Wings are bony plate and projects laterally.Supraspinous process is absent or, may be in the form of a tubercle.

Two foramens are present on the medial side and known as intervertebral foramen.

Two foramens are present on the medial side and known as intervertebral foramen.

Two foramen are present on lateral side and called alar foramen.

Two foramen are present on lateral side and called alar foramen.

Caudal side of floor of atlas consists of a dperession known as fovea dentis which gives lodgement to the dense or, odontoid process of axis.

Caudal side of floor of atlas consists of a dperession known as fovea dentis which gives lodgement to the dense or, odontoid process of axis.

On ventral side there is a shallow depression called fossa atlantis.

On ventral side there is a shallow depression called fossa atlantis.

In horse transverse foramen is present and fossa atlantis is deeper.caudal articular process is saddle shaped where as in case of horse it is nearly flattened.

In horse transverse foramen is present and fossa atlantis is deeper.caudal articular process is saddle shaped where as in case of ox it is nearly flattened.

Dog-wings are wide,flattened and horizontal.

Dog-wings are wide,flattened and horizontal.

Alar foramen is absent in that place a notch is present known as alar notch.

Alar foramen is absent in that place a notch is present known as alar notch.

Fowl-it is ring like bone.cranial surface is concave and gives lodgement to the single occipital condyle of occipital bone.

Fowl-it is ring like bone.cranial surface is concave and gives lodgement to the single occipital condyle of occipital bone.

Caudally there are three articular area for the attachment with axis.

Caudally there are three articular area for the attachment with axis.