Primitive streak Samenvattingen, Aantekeningen en Examens

Embryology Exam | Actual Questions with Answers| updated 2023/24 1. The part of the sperm containing proteolytic enzymes to digest the zona pellucida is the: A. capacitor B. head C. corona D. acrosome E. cumulus - D. is correct. The acrosome is the part of the sperm containing proteolytic enzymes to digest the zona pellucida. It is exposed by the process of capacitation. Then, under the influence of substances released by corona radiata cells, it releases its proteolytic enzymes a...

Anatomy Final COMPREHENSIVE Exam Questions In order to separate the abdomen from the thorax, which plane would you use? -sagittal -median (mid-sagittal) -parasagittal -frontal (coronal) -transverse transverse To separate the anterior (frontal) from the posterior (occipital) portion of the brain, which plane would you use? -transverse -midsagittal -parasagittal -coronal (frontal) -longitudinal coronal The primitive streak, which has developed into the cleft between your buttocks,...

Embryology 2023 Exam 2 Objectives: Lectures 9 (part)-16 | with complete solution Nodal is a signaling molecule produced by the primitive node. What is its role in the induction of the primitive streak and the establishment of left-right symmetry? It induces primitive streak and helps to establish left-right symmetry. It is a symmetry breaking molecule in the left side of the embryo. What is the first sign of asymmetry in early development? What roles are played by Nodal and Left-1? Involve...

Embryology Exam 2 | With complete solution | updated 2023/24 meiosis 1 nondisjunction homologous chromosomes fail to separate meiosis 2 nondisjunction sister chromatids fail to separate origin of the notochord ~ day 18, some of the epiblast in primitive node begins growing cranially toward oropharyngeal membrane, laying down the notochord. will be further extended as primitive streak regresses is the 4th major tissue to be derived from epiblast layer when does primitive stre...

Possible AAMI Anatomy Final Comprehensive Exam Questions & Answers 2024/2025 In order to separate the abdomen from the thorax, which plane would you use? -sagittal -median (mid-sagittal) -parasagittal -frontal (coronal) -transverse - CORRECT ANSWER-transverse To separate the anterior (frontal) from the posterior (occipital) portion of the brain, which plane would you use? -transverse -midsagittal -parasagittal -coronal (frontal) -longitudinal - CORRECT ANSWER-coronal The primi...

what is embryology? the study of prenatal development Embryo is what time period of development? 2nd to 8th week development Fetus is what time period of development? 9th week to birth what is development? maturation, becoming older what is growth? increase in weight or special dimension (increase in cell numbers, cell size or cell productions) facial development beings when? 4th week what is congenital malformation? birth defects congeni...

What week gestation does the breast begin to develop in utero? - *4th* week of gestation Where does the primitive milk streak develop - Bilaterally from the axilla to the groin By the 5th week gestation the milk streak becomes what? - Mammary Milk Ridge (or milk line) Thickening and inward growth into the chest wall continues during what weeks gestation? - *7-8* weeks gestation Between weeks 12 and 16 gestation specialized cells differentiate into what? - Smooth muscles of the nipple and a...

IBCLC Exam QUESTIONS & ANSWERS 2024 ( A+ GRADED 100% VERIFIED)

What week gestation does the breast begin to develop in utero? - correct answer *4th* week of gestation Where does the primitive milk streak develop - correct answer Bilaterally from the axilla to the groin By the 5th week gestation the milk streak becomes what? - correct answer Mammary Milk Ridge (or milk line) Thickening and inward growth into the chest wall continues during what weeks gestation? - correct answer *7-8* weeks gestation Between weeks 12 and 16 gestation specialized c...

Ectoderm doesn't move through the __________ or __________ ANSWER: 1) blastopore (frogs and fishes) or 2) primitive streak (birds and humans) Sensory organs all begin in the head as... ANSWER: placode - thickenings of surface ectoderm what are 4 types of cell interactions? ANSWER: 1) Internal/mechanical 2) Juxtacrine signaling 3) Paracrine signaling 4) Endocrine signaling Note: these are arranged in order of closest interaction to longest distance interaction The 6 word key to ...