What is formed by laminae and pedicles?

What is formed by laminae and pedicles?

The vertebral arch is formed by pedicles and laminae. Two pedicles extend from the sides of the vertebral body to join the body to the arch.

What are pedicles and laminae in a vertebrae?

The pedicle is a stub of bone that connects the lamina to the vertebral body to form the vertebral arch. Two short, stout processes extend from the sides of the vertebral body and joins with broad flat plates of bone (laminae) to form a hollow archway that protects the spinal cord.

What forms the spinous process in a typical vertebra?

The spinous process of a typical cervical vertebra is short and bifid posteriorly. It is bifid because it develops from two separate secondary centers of ossification. This morphology is unique to cervical spinous processes.

What is the laminae of the vertebrae?

The lamina is the flattened or arched part of the vertebral arch, forming the roof of the spinal canal; the posterior part of the spinal ring that covers the spinal cord or nerves.

What are pedicles of the vertebrae?

Pedicles. Each vertebra has two cylinder-shaped projections (pedicles) of hard bone that stick out from the back part of the vertebral body, providing side protection for the spinal cord and nerves. The pedicles also serve as a bridge, joining the front and back parts of the vertebra.

What does the vertebrae develop from?

Sclerotome. The vertebrae and associated ligaments are formed by the development of sclerotome cells into a segmental centrum which forms cartilage and then the bony vertebral body. Primary and secondary ossification centers provide growth areas to turn cartilage into bone.

What is the function of the laminae?

Lamina V: Neck of the dorsal horn. Neurons within lamina V are mainly involved in processing sensory afferent stimuli from cutaneous, muscle and joint mechanical nociceptors as well as visceral nociceptors. This layer is home to wide dynamic range tract neurons, interneurons and propriospinal neurons.

Which vertebrae have forked spinous processes?

Also, the spinous processes of cervical vertebrae are forked, or bifid.

Which vertebra has no spinous process?

C1, also known as “atlas,” is unique among all vertebrae in that it lacks both a vertebral body and a spinous process.

What are laminae made of?

The basal lamina consists of a mixture of collagens, laminin (glycoprotein), perlecan (heparan sulphate glycoprotein), entactin (glycoprotein). These proteins can bind to each other to make a highly crosslinked extracellular matrix as shown in this diagram.

What is the purpose of vertebral spinous and transverse processes?

On each vertebra, there are two transverse processes and one spinous process. The two transverse processes are located on either side of the ring, while the spinous process is located in the middle. These processes provide sites to which back muscles and ligaments attach.

Where are the vertebral pedicle?

Pedicle of vertebral arch – Pediculus arcus vertebrae.