By Jan E. Jirasek
Specified, awesome, accomplished, and unparalled - definite, it is all that and masses, even more. largely illustrated with greater than 500 colour and black-and-white photographs, An Atlas of Human Prenatal Developmental Mechanics is the definitive consultant to fashionable embryology. the writer describes and illustrates human prenatal improvement and staging as regards to anatomy and discusses the potential of following prenatal improvement with scientific equipment of prenatal diagnostics. overlaying the advance and staging of all embryonic structures, he offers the anatomic framework in accordance with direct photographic facts acquired solely on human embryos and fetuses.
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Extra info for An Atlas of Human Prenatal Development Mechanics: Anatomy And Staging
The blood of the third aortic arch reaches the head by way of internal carotid arteries. The artery of the left fourth arch becomes the aorta, the main artery of the body, while the arterial arch from the right fourth arch supplies the right anterior extremity as the proximal portion of the right subclavian artery. Segments of the dorsal aortae connecting third and fourth aortic arches disappear as the blood anterior to the fourth arch supplies the head, and the vessels of the fourth aortic arches supply the body Segments of the ventral aortae located anterior to the fourth arches become the common carotid arteries and ventral segments, which are anterior to the third aortic arches, change into the external carotid arteries.
5) The connective tissues capillaries and veins, bones and tendons arise from the mesenchyme of limb buds. (6) Myoblasts, nerves and arteries invade the primordium of limbs from adjacent somites. Muscles innervated by dorsal branches of the ventral rami contribute the extensors and supinators (upper limb), or extensors and abductors (lower limb). Muscles innervated by ventral branches of the ventral rami become flexors and pronators (upper limbs) and flexors and abductors (lower limbs). (7) Sensory axons accompany the motor axons and innervate the skin according to dermatomes.
The sagittal nasal septum divides the left and right nasal passages. In the inferior portion of the nasal septum, before fusion with the palatinal shelves, there is a tubular structure (in 17–20 mm embryos, stage 7–6) known as the vomeronasal organ of Jacobson. Neurons of this organ split from the olfactory epithelium and constitute the terminal nerve with a separate ganglion. 8). The uvula develops from the terminal portion of the soft palate. Merging of the soft palate and uvula is supported by the nasal septum apposed to the hard palate.