[UPDATED] The term [vasa vasorum] comes from the Latin [vasa] or [vas] meaning "a vessel", as in a container. Vasa vasorum means "the vessels of the vessels"

In arteries and veins, only the inner layer of the vessel, the endothelium can receive nutrition and oxygen from the blood that is carried by the vessel. Arteries and veins have their own blood supply network, their own arteries and veins. These are the vasa vasorum.

The image shows the internal structure of an artery with its three layers, tunica intima (named after Xavier Bichat), tunica media, and tunica adventitia, as well as the vasa vasorum. Click on the image for a larger depiction. 

The [obturator foramen] is a bilateral and roughly triangular opening in the lower portion of the pelvis bound by the following bones: ilium, ischium, and pubic bone. The obturator foramen is closed off by the obturator membrane, a though, tendinous membrane that leaves a small superior opening (obturator canal) that allows passageway of the obturator nerve, obturator artery, and obturator vein. These neurovascular structures provide nerve and blood supply to the anterior compartment of the thigh.

The obturator membrane serves as a point of attachment to the external obturator and internal obturator muscles.

The obturator foramen is important for transobturator sling surgery used in cases of urinary incontinency. 

Image property of: CAA.Inc. Artist: M. Zuptich

The  word [lambda] is Greek and is represented by the symbols [Λ] and [λ]. Because of the inverted "V" shape and inverted "Y" shape of these symbols, it was used by Galen of Pergamon (129AD - 200AD) to denote the junction of the sagital suture (interparietal articulation) and the occipitoparietal suture, also known as the "lamboid" suture. The lambda can also be described as the point of junction of the occipital bone with the parietal bones.

Although Galen named this junction originally, it was Vesalius (1514- 1564) who brought this name into modern anatomy. Later, Peter Paul Broca (1824- 1880) used this landmark as a craniometric point.

Click on the accompanying image of a posterior view of the cranium for a larger depiction.

Image in public domain, modified from Toldt's "Atlas of Human Anatomy", 1903.

Leonardo Botallus (c.1530- ??) Italian anatomist and physician,Leonardo Botallus (also known as Botalli, Botallo, or Botal) was born circa 1530 in the region of Piedmont. Botallus studied medicine at the italian university of Pavia, where he was a student under Gabrielle Fallopius.  Botallus graduated circa 1553.  He was an avid advocate of bloodletting, causing him to direct his anatomical studies towards the subject of the vascular system. Although he did not discover the foramen ovale and the ductus arteriosus, he mentions these structures by those names in both his posthumous  publications " De via sanguinis a dextro in sinistro cordis ventriculum" (1640) and "Opera Omnia Medica et Chirurgica" (1660)

Sources:
1. "History of medicine; a correlative text, arranged according to subjects" Mettler, C Ch. 1947 The Blakiston Co 
2. "Stedmans Medical Eponyms" Forbis, P; Bartolucci, SL. Williams & Wilkins 1998
3. "The origin of Medical Terms" Skinner, AH, 1970
4. "The First Closure of the Persistent Ductus Arteriosus" Alexi-Meskishvili,V; B?ttcher, W. Ann Thorac Surg 2010;90:349 –56
NOTE: There is no known image of Botallus. Skinner's "Origin of Medical Terms" shows one, but we could not confirm the origin of the image. If you know or have one, let us know! 

Galen of Pergamon (129AD - 200AD) named and described the lumbar vertebrae.

[UPDATED] The basivertebral foramen is an opening  in the posterior aspect of each vertebra (click on the picture for a larger image) which allows the exit of the basivertebral veins. These foramina can be single (as seen in the image) or multiple. The basivertebral veins represent a communication that allows drainage of the vertebral body venous sinuses into the extensive complex venous network of the internal venous plexuses that surrounds the spinal cord.

Photography by D.M.Klein