What is midline falx pregnancy?

The midline falx is visible as an echogenic line running anteroposteriorly in the midline bisecting the “butterfly” (Fig. 1.6). The posterior fossa contains the developing cerebellum.

What is a falx brain?

The falx cerebri is the largest of the four partitions of the dura mater, and represents an invagination of the meningeal layer of dura into the longitudinal fissure of the brain. This crescent-shaped sheet of tissue occupies this fissure and separates the two cerebral hemispheres.

What does FALX Cerebelli mean?

Medical Definition of falx cerebelli : the smaller of the two folds of dura mater separating the hemispheres of the brain that lies between the lateral lobes of the cerebellum.

What is the difference between falx cerebri and FALX Cerebelli?

The dura mater is partitioned into several septa, which support the brain. One of these, the falx cerebri, is a sickle-shaped partition lying between the two hemispheres of the brain. A third, the falx cerebelli, projects downward from the tentorium cerebelli between the two cerebellar hemispheres.

What is TCD in pregnancy ultrasound?

In obstetric imaging, the fetal transverse cerebellar diameter (TCD) is often measured as an additional fetal biometric parameter. It is measured as the maximal diameter between the cerebellar hemispheres on an axial scan.

What does bpd mean on an ultrasound?

Ultrasound measurements of biparietal diameter (BPD), head circumference (HC), abdominal circumference (AC) and femur length (FL) are used to evaluate fetal growth and estimate fetal weight.

What separates the two hemispheres of the cerebrum?

A fissure or groove that separates the two hemispheres is called the great longitudinal fissure. The two sides of the brain are joined at the bottom by the corpus callosum. The corpus callosum connects the two halves of the brain and delivers messages from one half of the brain to the other.

What is the falx cerebri formed by?

dura
Falx cerebri is a sickle-shaped vertical fold of dura that begins anteriorly at the crista galli and winds around the corpus callosum between the two cerebral hemispheres to reach the falcotentorial junction on the superior aspect of the tentorium cerebelli (Fig. 2.1A).

What does transverse sinus drain into?

The transverse sinuses are formed by the tentorium cerebelli and drain into the right and left sigmoid sinuses. They drain from the confluence of sinuses (by the internal occipital protuberance) to the sigmoid sinuses, which ultimately connect to the internal jugular vein.

Does pia mater contain CSF?

Function. In conjunction with the other meningeal membranes, pia mater functions to cover and protect the central nervous system (CNS), to protect the blood vessels and enclose the venous sinuses near the CNS, to contain the cerebrospinal fluid (CSF) and to form partitions with the skull.

What is the normal fetal weight?

Fetal growth chart

What is the normal TCD at 20 weeks?

Ultrosonographic measurement of Transverse cerebellar diameter (TCD) was done to assess the Gestational age. Mean TCD was 17.32 mm in 14–20 weeks of gestation, 26.63 mm in 21–30 weeks and 40.73mm in 31–40 weeks.