Anatomical Triangles

Question 1

Suboccipital triangle boundaries

Answer 1

rectus capitis posterior major (C2 spinous to occiput), obliquus capitis superior (C1 transverse to occiput), obliquus capitis inferior ( C2 spinous to C1 transverse process)

Question 2

Floor of suboccipital triangle

Answer 2

Posterior arch of C1

Question 3

Contents of suboccipital triangle

Answer 3

3rd part of vertebral artery, subocciptal nerve (dorsal ramus of C1) and suboccipital veins

Question 4

What nerve level(s) supply the muscles of the suboccipital triangle?

Answer 4

dorsal ramus of C1 (suboccipital)

Question 5

Anterior cervical triangle boundaries

Answer 5

anterior midline, inferior ramus of mandible, and anterior border of SCM

Question 6

Contents of anterior cervical triangle

Answer 6

All other triangles of the anterior neck (carotid, submandibular, submental, and muscular)

Question 7

Carotid triangle boundaries

Answer 7

Anterior SCM, posterior belly of digastric, and superior belly of omohyoid

Question 8

Contents of the carotid triangle

Answer 8

CN XI, XII, and carotid sheath

Question 9

Components of the carotid sheath located in the carotid triangle

Answer 9

common carotid artery, internal carotid a., internal jugular v., and CN X

Question 10

Submandibular triangle (digastric) boundaries

Answer 10

posterior and anterior bellies of digastric and inferior ramus of mandible

Question 11

Contents of the submandibular triangle

Answer 11

SUBMANDIBULAR gland, facial artery and vein, hypoglossal and mylohyoid nerve

Question 12

Submental triangle (suprahyoid) boundaries

Answer 12

Anterior bellies of BOTH digastric and hyoid bone

Question 13

Floor of submental triangle

Answer 13

mylohyoid muscles

Question 14

Muscular triangle boundaries

Answer 14

SCM, superior belly of omohyoid, and anterior midline of neck

Question 15

Contents of the muscular triangle

Answer 15

sternohyoid, sternothyroid and thyrohyoid muscles, THYROID, trachea and larynx

Question 16

Posterior cervical triangle boundaries

Answer 16

SCM, trapezius, and middle third of clavicle

Question 17

Posterior cervical triangle is subdivided by the inferior belly of omohyoid into these two triangles

Answer 17

occipital and supraclavicular

Question 18

Contents of the posterior cervical triangle (6 vessels, 7 nerves)

Answer 18

Vessels: subclavian artery, suprascapular, transverse cervical, occipital a., and subclavian and external jugular v.

Nerves: great auricular, lesser occipital, supraclavicular, transverse cervical, trunks of the CERVICAL PLEXUS, and CN XI

Question 19

Triangle o Auscultation boundaries

Answer 19

Trapezius, latissimus dorsi, and medial boarder of scapula (no contents)

Question 20

Lumbar triangle (of Petit) boundaries

Answer 20

latissimus dorsi, external oblique, iliac crest (no contents)

Question 21

Inguinal triangle (of Hesselbach) boundaries

Answer 21

rectus abdominis, inferior epigastric vessels, and inguinal ligament

Question 22

What is the inguinal ligament and where does it attach

Answer 22

Inguinal ligament is an infolding of the lower end of the aponeurosis of external oblique, and it extends from the ASIS to the pubic tubercle

Question 23

What composes the floor of the inguinal triangle

Answer 23

transversalis fascia

Question 24

Differentiate between direct and indirect hernias

Answer 24

Direct hernia passes through the inguinal triangle (hesselbach’s) indirect hernias pass through the deep deep inguinal ring which is a defect in the transversalis fascia

Question 25

Femoral triangle (of Scarpa) boundaries

Answer 25

inguinal ligament, medial boarders of sartiorius and adductor longus

Question 26

Contents of the femoral triangle

Answer 26

Femoral nerve, (femoral artery, femoral vein, and femoral canal - found in femoral sheath)

Question 27

what structure of the femoral triangle lies outside of the femoral sheath?

Answer 27

femoral nerve