ZOO 3734L - Gross Anatomy Lab II

Dissections of July 16 - 19, 2001

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; Moor and Augur, 1996; Stern, 1997).

PECTORAL REGION; ANTERIOR THORACIC WALL (Ch. 1; pp. 1-6)

Dissection notes

Contrá figure in dissector, need to skin cranial to clavicles to expose pectoralis major; need not encircle nipples
Skip dissection of breast, breast structures will be studied on model
Contrá dissectior, innermost intercostals cannot be seen in this dissection; these will be examined in posterior mediastinum
Modify the breastplate cuts to expand opening; detach serratus anterior from its attachments to ribs 2-6, leaving attachments to ribs 7 & 8; then cut ribs 2-6 close to mid-axillary line
Contrá your text, it is well established that both pectoral muscles (major and minor) are innervated by both pectoral nerves (medial and lateral) ); moreover, the only way to unambiguously distinguish the medial and lateral pectoral nerves is to trace them back to their cord of origin

landmarks/regions
	
	suprasternal notch (jugular notch)
	sternal angle
	deltopectoral triangle

osteology
	clavicle
	scapula
		coracoid process

myology
	pectoralis major
	pectoralis minor
	serratus anterior
	external intercostal
	internal intercostal
	(innermost intercostal)
	transversus thoracis

angiology
	cephalic 
	axillary a
		thoracoacromial a
	anterior intercostal a 
	anterior intercostal v
	(posterior intercostal a)
	(posterior intercostal v)
	internal thoracic a
	internal thoracic v

neurology
	lateral pectoral n
	medial pectoral n
	(intercostal nn)

misc. 
	breast - on model only
		gland lobe
			gland lobule
		lactiferous duct
		ampulla (of milk duct) = lactiferous sinus 
		areola (areola mammae)
		nipple (papilla mammae)
		retromamillary space
		pectoralis major

SHOULDER (Ch. 6, pp. 97-103)

landmarks/regions
	quadrangular space

misc. 
	brachial fascia
	antebrachial fascia
		flexor and extensor retinacula (of wrist)
	bicipital aponeurosis
	superior transverse scapular ligament

angiology
	basilic vein
	cephalic vein
	(median cubital vein)
	posterior circumflex humeral a
	profunda brachii a
	suprascapular a

myology
	trapezius
	lattisimus dorsi
	rhomboids
	levator scapulae
	deltoid
	triceps brachii:  lateral, long and medial heads
	teres minor
	teres major
	supraspinatus
	infraspinatus
	subscapularis

neurology
	axillary n
	radial n
	suprascapular n

AXILLA (Ch.6, pp. 103-106)

landmarks/regions
	axilla

misc. 
	axillary sheath

myology
	pectoralis major
	pectoralis minor
	latissimus dorsi
	teres major
	subscapularis
	serratus anterior
	biceps brachii:  long and short heads
	coracobrachialis
	
angiology
	axillary a
		thoracoacromial a
		lateral thoracic a
		subscapular a
			thoracodorsal a
			circumflex scapular a
		posterior humeral circumflex a
		anterior humeral circumflex a

neurology
	brachial plexus (VR C5-T1)
		long thoracic n
		lateral cord
			musculocutaneous n
			lateral root of median n
			(lateral pectoral n)
		medial cord
			ulnar n
			medial root of median n
			medial antebrachial cutaneous n
			medial brachial cutaneous n
			(medial pectoral n)
		posterior cord
			axillary n
			radial n
			upper subscapular n
			middle subscapular (thoracodorsal) n
			lower subscapular n

ARM (Ch. 6, pp. 106-107)

landmarks/regions
	cubital fossa

myology
	brachioradialis
	triceps brachii:  lateral, long and medial heads
	coracobrachialis
	biceps brachii:  long and short heads
	brachialis

neurology
	radial n
	musculocutaneous n
		(lateral antebrachial cutaneous n)
	median n
	ulnar n

angiology
	brachial a
		profunda brachii a
		ulnar a
		radial a

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