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Terms in this set (39)
What is the esophagus?
the muscular tube through which food passes to the stomach
What does the esophagus consist of?
1. an upper 1/3 composed of striated muscle
2. a middle 1/3 composed of mixed striated and smooth muscle
3. a lower 1/3 composed of smooth muscle
What are the three parts of the esophagus?
What part of the esophagus is the longest?
Where does the esophagus begin?
the laryngopharynx at CV 6
The esophagus is a median structure which enters where?
the thorax posterior to the trachea
Where does the esophagus enter through the abdomen through and then join?
the esophageal hiatus at TV 10 and joins the stomach at the cardioesophageal junction
What are the sphincters?
1. Superior esophageal sphincter
2. Inferior esophageal sphincter
What is the superior esophageal sphincter formed by?
the lower part of inferior
What is the inferior esophageal sphincter formed by?
encircling fibers of the diaphragm at the esophageal hiatus
What structure is distensible?
What is the blood supply to the esophagus?
1. inferior thyroid artery
2. bronchial artery2
3. esophageal artery
4. left gastric artery
5. inferior phrenic artery
What is the venous drainage of the esophagus?
1. esophageal veins
2. left gastric vein
Where did the esophageal vein drain into?
the adjacent systemic veins
Where did the left gastric vein drain into?
into the portal vein
What is the innervation of the esophagus?
1. vagus nerve
2. sympathetic fibers from thoracic cord levels
3. pain fibers carried in the sympathetic trunk
What does the vagus nerve contain?
1. special motor fibers
2. parasympathetic fibers
What does the special motor fibers of the vagus nerve supply?
the striated muscle portion of the eophagus (upper 1/3 and striated part of mixed middle 1/3)
What does the parasympathetic fibers of the vagus nerve supply?
the smooth muscle portion of the esophagus (lower 1/3 and smooth muscle part of mixed middle 1/3)
What are the parts of the thoracic aorta?
1. ascending aorta
2. aortic arch
3. descending aorta
Where is the ascending aorta in?
Where is the aortic arch in?
in the superior mediastinum
What are two branches of the descending aorta?
1. thoracic aorta
2. abdominal aorta
What is the thoracis aorta in?
What is the abdominal aorta in?
What is the cord level that the thoracic aorta begin in?
Where does the thoracic aorta lie?
posterior to the esophagus
The thoracic aorta begins its descent to?
the left of the vertebral column, but slants toward the midline of the body and ends directly anterior to the vertebral column
Where does the thoracic aorta pass through the aortic hiatus?
TV 12 to become the abdominal aorta
What are the branches of the thoracic aorta?
1. parietal branches
2. visceral branches
What do the parietal branches of the thoracic aorta supply?
supply the body wall:
-3rd through 11th intercostal arteries
-superior phrenic arteries
What do the visceral branches of the thoracic aorta supply?
supply thoracic viscera:
-bronchial arteries (1 right and 2 left)
- esophageal arteries
What important anastomoses occur in the thoracic aorta?
1. between the anterior and posterior intercostal arteries
2. between the superior and inferior epigastric arteries
Most of the lymph of the body reaches what system?
the venous system through the thoracic duct
The thoracic duct begins in the abdomen as a dilation at the junction of three abdominal trunks. What are these trunks and what are they called?
intestinal, lumbar, descending intercostal and they are called cisterna chyli
When the thoracic duct passes through the aortic hiatus of the diaphragm and travels upward?
travels upward through the posterior mediastinum between the aorta and the azygos vein
After passing upward through the posterior mediastinum, what vertebral level does the thoracic duct cross over to the left at?
TV 5 or TV 6
The thoracic duct passes posterior to the left subclavian vein, forms an arch, and empties where?
into the junction of the left internal jugular and subclavian veins
The thoracic duct drains the lymph of the entire body except the what?
1. right upper extremity
2. right thoracic cavity
3. right side of the head and neck
THIS SET IS OFTEN IN FOLDERS WITH...
UNIT II- LARYNX AND THORAX
LYMPHATICS OF THE HEAD AND NECK - UNIT 2
BREAST - UNIT 2
THORACIC WALL - UNIT 2
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