Prelab Lecture 2 Flashcards

1
Q

What are the nerves emerging deep to the SCM?

A

Supraclavicular (cutaneous nerves)

Accessory nerve

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2
Q
Pectoralis major
Origin
Insertion
Action
Nerve
A

Origin: medial half of clavicle, manubrium, body of sternum, costal cartilage of ribs 1-6, anterior layer of rectus sheathe

Insertion: crest of greater tubercle of humerus

Action: Adduction, internal rotation, flexion of arm (RESPIRATION WHEN SHOULDER FIXED)

Inn: Medial/lateral pectoral nerves of brachial plexus (C5, T1)

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3
Q
Serratus anterior
Origin
Insertion
Action
Nerve
A

Origin: ribs 1-9

Insertion: medial margin of costal surface of scapula

Action: Ext. rotation of scapula (in and forward) Lowers arm from raised position, elevates ribs

Nerve: Long thoracic nerve + brachial plexus (c5-C7)

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4
Q

What does cephalic vein run along?

A

Deltopectoral groove

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5
Q
Pectoralis minor
Origin
Insertion
Action
Nerve
A

Origin: ribs 3-5

Insertion: Coracoid process of scapula

Action: pulls scapula medially, forwards + downwards, aids in respiration

Nerve: medial + lateral pectoral nerves (c6-T1)

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6
Q

What are the boundaries of the posterior triangle?

A

SCN, Trapezius, clavicle

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7
Q
Deltoid 
Origin
Insertion
Action
Nerve
A

Origin: acromion, crest of spine of scapula, lateral 1/3 of clavicle

Insertion: deltoid tuberoistiy of the humerous

Action: adduction of arm, flexion + internal rotation (anterior fibers) and posterior fibers do ext. rotation + extensions

Nerve: Axillary nerve

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8
Q
SCM
Origin
Insertion
Action
Nerve
A

Origin: sternal head, anterior surface of manubrium, clavicular head, medial third of clavicle

Insertion: mastoid process

Action: flexion laterally head

Nerve: accessory

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9
Q
Omohyoid muscle (inf/superior)
Origin
Insertion
Action
Nerve
A

Origin (sup): intermediate tendon
Insertion: lower border hyoid lateral to sternohyoid
Action:depression + stabilization of hyoid + larynx for phonation + swallowing
Nerve: superior root of ansa cervicalis

Origin (inf): Upper border of scapula medial to scapula notch
Insertion: intermediate tendon
Action: depression for swallowing + phonation
nerve: inferior root of ansa cervicalis

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10
Q

What does the external jugular vein cross?

A

The posterior triangle, superficial to SCM

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11
Q

What are the arteries branching off the thyrocervical trunk? What artery is next to these?

A

Transverse cervical
Suprascapular

Next to dorsal scapular artery

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12
Q

What are the brachial plexus roots?

A

Ventral rami of C5-T1

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13
Q

What are the main contents of the posterior triangle?

A

Ventral rami C1- C4 (Cervical plexus)

Spinal accessory nerve

Supraclavicular nerves
Prenic nerve ( C3, C4, C5)

Transverse cervical + supra scapular arteries

Brachial plexus (C5-T1)

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