USMLE Step 1 Review/Anatomy

LOCATION OF THORACIC DUCT

• The duck is between two geese (duck = thoracic duct)
• 2 geese = azyGOUS and esophaGUS

BRACHIAL PLEXUS

Roots, Trunks, Divisions, Cords, Branches:

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ATTACHMENTS OF CHEST MUSCLES

• A lady between two majors.
• Pectoralis major attaches to lateral lip of bicipital groove.
• Teres major attaches to medial lip of bicipital groove.
• Latissimus dorsi attaches to the floor of bicipital groove.
• The "lati" is between two "majors."
• "Lateral is less, medial is more."
• Lateral pectoral nerves goes through pectoralis major while medial pectoral nerve goes though both pectoralis major and minor

CRANIAL NERVES

I - olfactory, II - optic, III - oculomotor, IV - trochlear, V - trigeminal, VI - abducens, VII - facial, VIII - acoustic (vestibulocochlear), IX - glossophrayngeal, X - vagus, XI - accessory, XII - hypoglossal

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• You have I nose. You have II eyes. (I - Olfactory; II - Optic)

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• OLd OPie OCasionally TRies TRIgonometry And Feels Vague GLOomy And HYPOactive (letters in capital have similar in CN's.)
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• Choirs Of Silly Singers Sing Rhyms Out Side In Imertinent Jollienss Joyfully Jogging Home (to remember exits of cranial nerves (+2 for the 3 branches of CN:V)
• Oh Oh Oh To Touch And Feel Various Girls Very Attractive Hair(Cranial Nerves)
• Oh Oh Oh To Touch And Feel A Girl's Vagina, AH! (Cranial Nerves)

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Deep Reflexes

Biceps (C5-6) elbow flexion

Brachio-radialis (C5-6) elbow flexion & supination

Triceps (C7) elbow extension

Patellar (L3-4) knee extension = knee jerk

Achilles (S1) plantar flexion = ankle jerk

LR6 SO4 R3

• LR6 - Lateral Rectus --> CN VI Abducens
• SO4 - Superior Oblique --> CN IV Trochlear
• R3 - The Remaining 4 eyeball movers --> CN III Occulomotor
• or LAST: LA = Lateral Rectus - Abducens Nerve, ST = Superior Oblique - Trochlear Nerve

BRANCHES OF FACIAL NERVE

Temporal, Zygomatic, Buccal, Mandibular, Cervical

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CERVICAL SPINAL NERVES

• c345 keep the diaphragm alive (innervation of diaphragm by the phrenic nerve)
• c5-6-7 raise your arms to heaven (nerve roots of long thoracic nerve innervate serratus anterior and if severed you see "winging" of the scapula)

INNERVATION OF PENIS

• Parasympathetic causes erection. Sympathetic causes ejaculation. "Point and Shoot."
• "S2, 3, 4 keep the penis off the floor"
• Innervation of the penis by branches of the pudendal nerve, derived from spinal cord levels S2-4

AORTIC BRANCHES

• ABC'S
• Aortic arch gives off the Brachiocephalic trunk, the left Common Carotid, and the left Subclavian artery

Order of things in the Femoral Triangle

• "N(AVEL)" (From Lateral To Medial)
• Nerve, Artery, Vein, Empty space, Lymphatics

NOTE: Parenthesis includes things contained in the femoral sheath.

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LOCATION OF INQUINAL HERNIAS with Reference to the Inferior Epigastric Arteries:

• "MDs don't LIe" (Medial- Direct, Lateral - Indirect): Direct inquinal hernias are Medial while Indirect hernias are Lateral to the inferior epigastric arteries

Addendum Module: More Through Anatomy Notes - This page is just temporary until the additional information in that page can be better organized over multiple chapters/sections along with the rest of this book.