[5] PRELIMS | MILESTONES OF FETAL DEVELOPMENT Flashcards
The embryonic stage starts on ____ and continues until approximately the ____
starts on day 15; continues until the 8th week
3 Weeks - Embryonic disk becomes ____ and ____-shaped, with a ____ cephalic end and ____ caudal end
Embryonic disk becomes elongated and pear-shaped, with a broad cephalic end and narrow caudal end
3 Weeks - ____ has formed a long ____ tube for ____
Ectoderm has formed a long cylindrical tube for brain and spinal cord development
3 Weeks - ____ from the endoderm appear as a ____
GIT from the endoderm appear as a tube-like structure
3 Weeks - the most advanced organ is the:
Heart
4-5 Weeks - during days ____, the ____ (or a series of mesodermal blocks) form on either side of the embryo’s midline
During days 21 to 32, the somites (or a series of mesodermal blocks) form on either side of the embryo’s midline
4-5 Weeks - Prior to ____, arm and leg buds are ____, but the tail bud is ____
Prior to 28 days, arm and leg buds are not visible, but the tail bud is present
4-5 Weeks: The pharyngeal arches – which will form the ____, ____, and ____ – develop at this time
The pharyngeal arches – which will form the lower jaw, hyoid bone, and larynx – develop at this time
4-5 Weeks - The ____ appear now; these pouches will form the ____ and cavity of the ____, the ____, and the ____
The pharyngeal pouches appear now; these pouches will form the eustachian tube and cavity of the middle ear, the tonsils, and the parathyroid and thymus glands
4-5 Weeks - The primordial of the ____ are also present
The primordial of the ear and eye are also present
4-5 Weeks - During the ____, the ____ of the eye form and the ____ develop
During the fifth week, the optic cups and lens vessels of the eye form and the nasal pits develop
4-5 Weeks - Partitioning in the heart occurs with the dividing of the ____
Partitioning in the heart occurs with the dividing of the atrium
4-5 Weeks - Embryo has marked ____ body, accentuated by the ____ and the large head folded over a ____
Embryo has marked C-shaped body, accentuated by the rudimentary tail and the large head folded over a protuberant trunk
4-5 Weeks - By ____, the arm and leg buds are well developed, with ____ and foot plates. The ____, ____, and ____ show the most advanced development
By day 35, the arm and leg buds are well developed, with paddle-shaped hand and foot plates. The heart, circulatory system, and brain show the most advanced development
4-5 Weeks - Brain has differentiated into ____ areas, and ____ pair of cranial nerves are recognizable
Brain has differentiated into five areas, and 10 pair of cranial nerves are recognizable