what is the difference between pia-mater and dia-mater?

Answer 1

the spelling

Answer 2

Dura Mater Pia Mater

Answer 3

Pia mater

The pia mater (Latin: "tender mother", itself a translation from Arabic) is the delicate innermost layer of the meninges - the membranes surrounding the brain and spinal cord.

The thin, mesh-like pia mater closely envelops the entire surface of the brain, running down into the fissures of the cortex. It joins with the ependyma which lines the ventricles to form choroid plexuses that produce cerebrospinal fluid.

I think you mean the Dura-Mater

Dura mater

The dura mater (from the Latin "hard mother"), or pachymeninx, is the tough and inflexible outermost of the three layers of the meninges surrounding the brain and spinal cord. The other two meningeal layers are the pia mater and the arachnoid mater. The dura mater isn't as tightly fitting around the spinal cord, extending past the spinal cord (which ends at L2, or second lumbar vertebra) to about the S2 (second sacral vertebra).

The dura mater has two layers: a deep layer and a superficial layer that is actually the skull’s inner periosteum, the membrane that lines bone. The dura separates into two layers at dural reflections, places where the inner dural layer is reflected as sheet-like protrusions into the cranial cavity.

There are two main dural reflections. The tentorium cerebelli exists between and separates the cerebellum and brainstem from the occipital lobes of the cerebrum (Shepherd, 2004). The falx cerebri, which separates the two hemispheres of the brain, is located in the longitudinal cerebral fissure between the hemispheres (Williams et al, 2002).

Channels called dural venous sinuses form between the two dural layers at dural reflections. These sinuses drain blood and cerebrospinal fluid from the brain and empty into the internal jugular vein. Meningeal veins, which course through the dura mater, and bridging veins, which drain the underlying neural tissue and puncture the dura mater, empty into these dural sinuses.

A subdural hematoma occurs when there is an abnormal collection of blood between the dura and the arachnoid, usually as a result of torn bridiging veins secondary to head trauma. An epidural hematoma is a collection of blood between the dura and the inner surface of the skull, and is usually due to arterial bleeding.

The American Red Cross and some other agencies accepting blood donations consider dura mater transplants, along with receipt of pituitary-derived growth hormone, a risk factor due to concerns about Creutzfeldt-Jakob disease

Answer 4

The pia mater is very thin and is in direct contact with the brain. It cannot remove it without disrupting brain tissue. The dura-mater is the outer most of the three layers of brain coverings. It is very tough (dura mater literally means "tough mother").

Answer 5

Your pia mater and the dura mater are inside the brain. The pia is the outermost layer and the dura mater is the innermost.

Answer 6

Pia Matter

Answer 7

Diameter is the distance across a circle or round object.

Circumference is the distance around it.

Oh I thought you had typos. My bad. My offering is still good for geometery, regardless. ;)