ZOO 3733L - Gross Anatomy Lab I

Dissections of May 20 - 23, 2002

N.B.		In each dissection some names appear in parentheses. These are structures that may not readily be found during your dissection, i.e., look for them but do not spend too much time on them so that you have time to comlete the laboratory. Many of these structures will be exposed more completely in future dissections or are best observed in your atlas. Also, there will be important structures listed that are not found in your dissector (Hansen, 1998); information about these items can be found in your text (Jenkins, 1998; Moore & Agur, 2002; Stern, 1997).

POSTERIOR MEDIASTINUM (Ch. 1, pp. 15-6)

Dissection notes

Remove all the parietal pleura and pericardium using blunt dissection, then find the following structures.

myology
	innermost intercostals
	internal intercostals

neurology
	(esophageal plexus)
	vagus n
		l. recurrent laryngeal n
	sympathetic trunk
		sympathetic chain ganglia
		greater splanchnic n
		(rami communicates)
	intercostal nn

angiology
	posterior intercostal veins
	azygos venous system
			azygos v
			hemiazygos v
			accessory hemiazygos v
	descending aorta
		thoracic aorta
			posterior intercostal aa
			(bronchial aa)
			(esophageal aa)

splanchnology
	esophagus
	thoracic (lymphatic) duct
	trachea
		bifurcation
		carina
		R & L primary bronchi

SUPERIOR MEDIASTINUM (Chap. 1; pp. 16-17)

Dissection notes

The sternum will be reflected using a technique different from that described in your text (Section B., p. 16); your instructors will assist:
1. Cut the first rib (R1) lateral to the insertion of the subclavius muscle and medial to where the axillary artery and vein cross it (see Netter Plate 175).
2. Cut the clavicle at the junction of the attachment of the deltoid and pectoralis major muscle. Make these cuts bilaterally and then gently rotate the sternum cranially, freeing any soft tissue adhesions.

landmarks/regions
	superior mediastinum

angiology
	subclavian v
	internal jugular v
		brachiocephalic vv
			superior vena cava
	azygos v
	aorta
		ascending aorta
		arch of the aorta
			brachiocephalic trunk
			left common carotid a
			left subclavian a
		descending aorta
	pulmonary trunk
	ligamentum arteriosum (remnant of ductus arteriosum)

neurology
	phrenic n
	vagus (CN X) n
		l. recurrent laryngeal n

splanchnology
	(thymus gland)

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	The sternum will be reflected using a technique different from that described in your text (Section B., p. 16); your instructors will assist:
	1.	Cut the first rib (R1) lateral to the insertion of the subclavius muscle and medial to where the axillary artery and vein cross it (see Netter Plate 175).
	2.	Cut the clavicle at the junction of the attachment of the deltoid and pectoralis major muscle. Make these cuts bilaterally and then gently rotate the sternum cranially, freeing any soft tissue adhesions.