Human Embryology Week 7 Quiz

<p>Cartilage model of skeletal structure (C)</p> Signup and view all the answers

<p>The length from the head to the buttocks of the embryo (B)</p> Signup and view all the answers

<p>Formation of ossification centers (D)</p> Signup and view all the answers

<p>Endochondral ossification (D)</p> Signup and view all the answers

<p>15–20 mm (C)</p> Signup and view all the answers

<p>They begin to merge and take the shape of the external ear. (C)</p> Signup and view all the answers

<p>Early development has started, but it is not yet formed. (D)</p> Signup and view all the answers

<p>90-degree counterclockwise rotation. (D)</p> Signup and view all the answers

<p>The cranial limb moves to the right side of the body. (C)</p> Signup and view all the answers

<p>Neurogenesis with an increase in neural precursor cells. (C)</p> Signup and view all the answers

<p>Prosencephalon. (D)</p> Signup and view all the answers

<p>Increased complexity of blood flow patterns. (A)</p> Signup and view all the answers

<p>Formation of distinct left and right atria and ventricles. (B)</p> Signup and view all the answers

<p>Distinguishable shape of the hand with separate fingers (C)</p> Signup and view all the answers

<p>As thickened ridges of tissue on the foot plate (B)</p> Signup and view all the answers

<p>It separates the individual toes from each other (A)</p> Signup and view all the answers

<p>Prominent craniofacial development (C)</p> Signup and view all the answers

<p>Pigmentation of the retina (D)</p> Signup and view all the answers

<p>Precursor tissues for the external ear that form in Week 7 (A)</p> Signup and view all the answers

<p>It maintains a somewhat spherical shape (A)</p> Signup and view all the answers

<p>Prominence of eyes (A)</p> Signup and view all the answers

<p>It marks the initial aggregation of cells that will form cartilage models. (D)</p> Signup and view all the answers

<p>Week 7 (A)</p> Signup and view all the answers

<p>They aggregate and form the initial cartilage models. (D)</p> Signup and view all the answers

<p>It sculpts the separation between the fingers. (D)</p> Signup and view all the answers

<p>Cartilage matrices formed from mesenchymal condensation. (C)</p> Signup and view all the answers

<p>Appearance of digital rays. (C)</p> Signup and view all the answers

<p>The humerus, radius, and ulna. (A)</p> Signup and view all the answers

<p>The replacement of cartilage with bone tissue. (C)</p> Signup and view all the answers

Mesenchymal cells gather and condense into distinct shapes that will later become bones.

Mesenchymal cells transform into chondrocytes, which produce the cartilage matrix. These cells are found in the cartilage model of bones such as the humerus, radius, and ulna.

The cartilage formed in the early stages serves as a template for bone development.

The process of replacing cartilage with bone, starting with the formation of primary ossification centers.

Thickened ridges in the hand plates which mark the future fingers.

Programmed cell death that sculpts the spaces between the developing fingers.

The process of separation and formation of the fingers.

The clear formation of toe rays, which are ridges marking the future toes.

The process of separating the fingers, forming the distinct shape of the hand.

The development of the hand with recognizable digits.

The earliest stages of toe development, marked by thickened ridges on the foot plate.

The process of toes becoming more distinct and visible as ridges on the developing foot.

The process of the eyes becoming larger and more prominent, with pigment starting to develop in the retina.

The formation of external ears from auricular hillocks, which are small tissue bumps.

The initial development of eyelids, but not yet fully formed.

The early stages of differentiation of the cornea and lens, giving the eye a slightly spherical shape.

The process of bone formation from cartilage, starting in specific centers within the developing bone.

The first centers of ossification to appear within a bone, initiating the conversion of cartilage to bone.

The stage of skeletal development where bones are initially formed as cartilage models.

The cells responsible for forming cartilage tissue, which later contributes to the development of bones.

Changes in the embryo's size, measured from the crown of the head to the bottom of the buttocks.

The process of limb development, forming the arms and legs from buds that emerge from the embryo's body.

The development of the face, including the formation of facial features like the eyes, nose, and mouth.

A period during week 7 of embryonic development when the cartilaginous skeleton begins to ossify, starting with the humerus, ulna, and radius.

The outer ear, made of cartilage and skin, starts to take shape as the auricular hillocks fuse together.

The early stages of the ear canal are initiated by the formation of the auricular hillocks, which are small bumps of tissue, and the arrangement of the pharyngeal arches.

The first 90-degree rotation of the midgut loop happens during week 6, around the superior mesenteric artery. This is essential for organizing the intestines within the abdomen.

The rotation of the midgut loop moves the top part of the loop to the right and the bottom part to the left. This determines the position of the small and large intestines.

The forebrain, midbrain, and hindbrain are the major divisions of the brain that begin to form during week 7.

During week 7, the brain develops by adding new brain cells and forming cavities for cerebrospinal fluid circulation. This makes the brain more complex and allows the fluid to support it.

The heart is developing distinct chambers and the connection between the heart and the blood vessels is becoming more complex.

During week 7, the brain grows, which influences the development of the face and skull.