Development Of Body Cavities💘

Question 1

Embryonic folding

Answer 1

Happens during the fourth week
Occurs in the median plane producing a head fold and tail fold
Also lateral folds
Curves into a c shape

Question 2

The head golf and tail fold turn into

Answer 2

Head cold brings devolving heart and mouth into their adult positions
Tail fold brings devolving anus into position
Lateral folds incorporate dorsal of yoke sac into the embryo as the primitive gut which differentiate into anterior foregut intermediate midgut and posterior hindgut

Question 3

The parietal mesoderm forms

Answer 3

Serous membranes that line outside walls of peritoneal pleural and pericardial cavities
Pleura lines kings pericardium for heart and peritoneum lines abdomen
Visceral layer forms membrane covering these organs and are continuous

Question 4

Parts of the thoracic and peritoneal cavities

Answer 4

Diaphragm separates the two
Thoracic cavity has three sections (two pleural and one pericardial)
Peritoneal cavity has four sections septum transversum ,pleuroperironeal membranes, dorsal mesentry of esophagus and muscular components from somites(c3 to c5) of body wall
Pleural sacs derived from mesoderm

Question 5

Lung development

Answer 5

Outgrowth from foregut called lung bud
The endotherm lining the respiratory diverticulum gives rise to epithelium and glands of trachea bronchi and alveoli
Mesoderm lining rd becomes connective tissue cartilage and smooth muscle
Rd enlarges to form a tracheal bud giving rise to trachea which divides into bronchial buds which branch repeatedly to form bronchi and bronchioles

Question 6

Lobar emsyphma

Answer 6

Interferes with infants airways by trapping airflow during breathing causing over inflation or lungs

Question 7

Pericardial diaphragmatic herniation

Answer 7

Pericardia-peritoneal canal fails to close so intestine moves into thorax causing lung compression (hypoplasia)

Question 8

Entratuok of diaphragm

Answer 8

Lack of muscular tissue in body wall so eventration of diaphragm causing lung compression/ hypoplasia

Question 9

Pleura membrane

Answer 9

Parietal pleura lines wall of thorax visceral covers lungs
Pleural cavity also contains fluid which reduces friction between the membranes so they can slide over each other also causes membranes to adhere to each other via surface tension