EMBRIOGENESIS MANUSIA PDF

Embriogenesis adalah proses pembelahan sel dan diferensiasi sel dari embrio manusia yang terjadi pada saat tahap-tahap awal dari perkembangan manusia tepatnya sejak fertilisasi sampai akhir dari minggu ke-8 dari perkembangan manusia Langman, Traditional artificial division: Periode Embryonic : 8 minggu awal kehamilan Semua organ utama Periode embrio dianggap waktu yang paling kritis dalam perkembangan manusia dari induksi cacat lahir. This triggers the acrosomal reaction, or the release of enzymes stored in the sperms acrosome e. These enzymes help the sperm drill through the zona pellucida Once the sperm has penetrated the outer layers it fuses with the plasma membrane of the egg and releases its contents inside. The head and the tail of the sperm degrade, so that all mitochondria in the embryo and all mitochondrial DNA come from the mother.

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Kami berharap bahwa Anda menikmati presentasi ini. Untuk men-download , silahkan rekomendasi presentasi ini kepada teman-teman Anda dalam jaringan sosial. Tombol yang haris diklik terletak di bawah posting ini. Terima kasih. Diterbitkan oleh Kharis Cyng Telah diubah "5 tahun yang lalu. Steps of neurulation include the formation of the dorsal nerve cord, and the eventual formation of the central nervous system.

The process begins when the notochord induces the formation of the central nervous system CNS by signaling the ectoderm germ layer above it to form the thick and flat neural plate.

In primary neurulation, the neural plate creases inward until the edges come in contact and fuse. In secondary neurulation, the tube forms by hollowing out of the interior of a solid precursor. Ectodermal cells are induced to form neuroectoderm from a variety of signals. Ectoderm sends and receives signals of BMP4 bone morphogenic protein and cells which receive BMP4 signal develop into epidermis.

These inhibitory signals are created and emitted by the spemann organiser. Cells which do not receive bone morphogenic protein BMP4 signaling due to the effects of the inhibitory signals will develop into the anterior neuroectoderm cells of the neural plate. Cells which receive FGF fibroblast growth factor in addition to the inhibitory signals form posterior neural plate cells.

The cells move laterally and away from the central axis and change into a truncated pyramid shape. This pyramid shape is achieved through tubulin and actin in the apical portion of the cell which constricts as they move.

As a result of the cellular shape changes, the neural plate forms the medial hinge point MHP. The expanding epidermis puts pressure on the MHP and causes the neural plate to fold resulting in neural folds and the creation of the neural groove.

The fusion requires the regulation of cell adhesion molecules. The neural plate switches from E-cadherin expression to N-cadherin and N-CAM expression to recognize each other as the same tissue and close the tube. This change in expression stops the binding of the neural tube to the epidermis.

Embrio mencit umur kebuntingan 8,5 hari; a. Prior to neurulation, during the migration of epiblastic endoderm cells towards the hypoblastic endoderm, the notochordal process opens into an arch termed the notochordal plate and attaches overlying neuroepithelium of the neural plate. Some of the notochodral cells become incorporated into the center section neural plate to later form the floor plate of the neural tube.

The notochord plate separates and forms the solid notochord. Instead, it begins approximately at the level of the fourth somite at Carnegie stage 9 around Embryonic day 20 in humans. The lateral edges of the neural plate touch in the midline and join together. This continues both cranially toward the head and caudally toward the tail. The openings that are formed at the cranial and caudal regions are termed the cranial and caudal neuropores.

Neural tube menggelembung membentuk 3 vesikula yaitu; Prosencephalon otak depan Mesencephalon otak tengah Rhombencephalon otak belakang Pada waktu ujung posterior neural tube menutup, dibentuk penonjolan baru, vesikula optik, menonjol dari kedua sisi lateral otak depan. Pada aves dan mamalia pembatas pada ketiga wilayah otak tampak lebih jelas karena terjadi pembengkokan fleksi pada daerah bakal otak yaitu fleksi kranealis dan servikalis.

Pada aves dan mamalia calon otak menjadi tiga wilayah otak tampak lebih jelas karena terjadi pembengkokan fleksi pada daerah bakal otak yaitu fleksi kranealis dan servikalis. Prosencephalon Diencephalon caudal daerah thalamus, hipotalamus dengan hipofisa dan hipofisa posterior 2. Mesencephalon Rongga aquaduct cerebral.

Rhombencephalon Myencephalon posterior Medulla oblongata. Plant tissue As in animals, plants also consist of cells. Where these cells form a network, then from the network to form organs. These organs have the. Oleh : Eko Prianto. Presentasi serupa. Upload Masuk. Presentasi saya Profil Tanggapan Keluar. Otorisasi melalui jaringan sosial: Pendaftaran Lupakan kata sandi? Upload presentasi. Batalkan Download. Presentasi sedang didownload. Silahkan tunggu.

Salin ke Clipboard. Presentasi berjudul: "Neurulasi Win Darmanto, Ph. Mesencephalon Rongga aquaduct cerebral 40 Metencephalon anterior Cerebrum, Pons varoli 3. Download ppt "Neurulasi Win Darmanto, Ph. Win Darmanto, Ph. Tentang proyek SlidePlayer Syarat penggunaan. Tanggapan Pengaturan dan alat privasi Tanggapan. All rights reserved. To make this website work, we log user data and share it with processors.

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PATHWISE LESSON PLAN TEMPLATE PDF

Perkembangan pranatal

Perkembangan pranatal ialah proses gestasi embrio atau janin manusia sewaktu kehamilan , dari persenyawaan hingga kelahiran. Selepas persenyawaan, bermulanya embriogenesis. Dalam manusia, selepas embriogenesis selesai, pada akhir minggu ke umur gestasi , terbentuklah pelopor kepada semua organ tubuh yang utama. Oleh itu, tempoh yang berikutnya iaitu tempoh janin, diperikan mengikut organ demi organ dari satu segi, dan berasaskan perkembangan utama mengikut minggu umur gestasi dari segi yang lain.

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EMBRIOGENESIS MANUSIA PDF

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