Items tagged “embryology”

10 results found

Wolffian duct

The Wolffian duct (also known as the mesonephric duct) is one of the paired embryogenic tubules that drain the primitive kidney (mesonephros) to the cloaca. It also gives off a lateral branch forming the ureteric bud. In both the male and the female, the Wolffian duct develops into the trigone o...

Brain development (diagram)

 Diagnosis not applicable
Dr Mohammad Taghi Niknejad
Published 04 Jan 2013
32% complete

Median umbilical ligament

 Diagnosis almost certain
Dr Ian Bickle
Published 13 Jul 2013
80% complete

Pre-axial and post-axial borders

Pre-axial and post-axial borders describe where the flexor and extensor compartments of the limb meet during foetal limb bud development. These borders are also conveniently marked out by veins. Pre-axial (cranial) border demarcates portion of the limb bud that lies cranial to the axis of ...

Central nervous system embryology

Central nervous system (CNS) embryology is complex, and below is a brief summary of its development.  The early CNS begins as a simple neural plate that folds to form a groove then tube, open initially at each end. Within the neural tube stem cells generate the two major classes of cells that m...

Radiation effects on embryonic and fetal development

Radiation effects on embryonic and fetal development are generally considered low risk compared to the normal risks of pregnancy. Most diagnostic x-ray and nuclear medicine examinations are <50 mSv and have not been demonstrated to produce any significant impact on fetal growth and development. ...

Branchial apparatus

The branchial (or pharyngeal) apparatus is the complex region in the developing embryo between the head and chest that develops in the fourth week and provides bilateral ridges and valleys that subsequently develop into numerous anatomic structures of the head, face, palate and anterior neck. Th...

Germinal matrix

The germinal matrix is an embryological structure in the fetal brain which is only seen in the fetus and in premature neonates. It is the most vulnerable area of the fetal brain and associated pathology carries significant mortality and morbidity.  Gross anatomy  The germinal matrix is usually...


Placode (or neural placode) refers in terms of radiology to a segment of non-neurulated neural tissue, which has had development frozen in the neural plate stage. A placode can be found in all open spinal dysraphisms and in some closed spinal dysraphisms. In the former, the placode is exposed to...

Anterior meningocele

Anterior meningocele is characterized by herniation of CSF-filled sac through a sacral anterior osseous defect. It is consistently found in the caudal regression syndrome. It is in continuity with the thecal sac and lined by arachnoid and dura mater, but does not contain neural tissue. Contrar...

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