What is Preaxial and Postaxial border?
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.
Why is it called Preaxial?
situated before an axis; in anatomy, referring to the lateral (radial) aspect of the upper limb, and the medial (tibial) aspect of the lower limb.
What does Preaxial mean?
Definition of preaxial : situated in front of an axis of the body.
What is Postaxial?
Definition of postaxial : of or relating to the ulnar side of the vertebrate forelimb or the fibular side of the hind limb also : of or relating to the side of an animal or side of one of its limbs that is posterior to the axis of its body or limbs.
What is Preaxial polydactyly?
Preaxial Polydactyly (PPD) Preaxial polydactyly refers to polydactyly where the additional digit grows toward the first digit of the hand (radial side; thumb) or foot (medially). The incidence of PPD is reported as high as 10/300 births (Deng et al., 2015; Manske et al., 2017).
What is caudal border?
adj. 1 (Anatomy) of or towards the posterior part of the body. 2 (Zoology) relating to, resembling, or in the position of the tail.
What is axial polydactyly?
Postaxial polydactyly (PAP) is a frequent congenital hand malformation characterized by fifth digit duplications in hands and/or feet. The prevalence estimates range from 1/630 to 1/3300 in Caucasians and from 1/100 to 1/300 in Blacks.
What causes Preaxial polydactyly?
Preaxial type 1 polydactyly is caused by sequence variants in the sonic hedgehog (SHH) enhancer, called zone of polarizing activity (ZPA) regulatory sequence (ZRS) (Lettice et al., 2002; Wieczorek et al., 2010; Perez-Lopez et al., 2018).
How common is Preaxial polydactyly?
Thumb duplication, which is sometimes also called pre-axial polydactyly or bifid thumb, is one of the more common congenital hand conditions. About one out of every 1,000 babies has the condition.
Why is cephalic vein called?
Its name derives from ‘cephalic’ meaning head, as the vein runs up to the shoulder. The cephalic vein drains the radial part of the hand, forearm and arm and communicates along its course with the basilic vein, which drains the ulnar part. The cephalic vein empties directly into the axillary vein.