Triangles And Fossas

Question 1

Posterior triangle boundaries

Answer 1

A: posterior border SCM
P: anterior border trap
I: middle third clavicle
Floor: splenius capitus, levator scap, scalene mm (covered by prevertebral fascia)

Question 2

Posterior triangle contents

Answer 2

External jugular v, cervical plexus cutaneous brr, lesser occipital n, great auricular n, CNXI, phrenic n, subclavian v and a; a, brachiocephalic v, cervicodorsal v, occipital a, brachial plexus roots, suprascapular n and a

Question 3

Anterior triangle boundaries

Answer 3

A: neck midline
P: anterior border SCM
I: inferior border mandible
Floor: pharynx, larynx, thyroid

Question 4

Anterior triangle contents

Answer 4

Infra and suprahyoid mm, common and int/ext carotid aa, int and ext jug vv, retromandibular v, CN X, XI, XII, cervical plexus

Question 5

Roof of all triangles

Answer 5

Skin, superficial fascia, platysma, deep fascia

Question 6

Carotid triangle boundaries

Answer 6

M: superior belly omohyoid
S: posterior belly digastric
L: anterior border SCM
Floor: hyoglossus, thyrohyoid, middle and inf constrictors of pharynx

Question 7

Submandibular triangle boundaries

Answer 7

S: inferior margin mandible
A: ant belly digastric
P: post belly digastric
Floor: mylohyoid, hyoglossus, middle pharyngeal constrictor

Question 8

Submandibular triangle contents

Answer 8

Submandibular gland & lymph nodes, CN XII, mylohyoid n, parts of facial a and v

Question 9

Carotid triangle contents

Answer 9

Carotid sinus, carotid body, common carotid and int/ext carotid, IJV, vagus n, ansa cervicalis, deep cervical lymph nodes

Question 10

Muscular triangle boundaries

Answer 10

SL: superior belly omohyoid
IL: anterior border SCM
M: median plane of neck

Question 11

Muscular triangle contents

Answer 11

Infrahyoid mm, thyroid and parathyroid glands

Question 12

Submental triangle boundaries

Answer 12

I: body of hyoid
L: right and left anterior bellies of digastric
Floor: mylohyoid muscles

Question 13

Submental triangle contents

Answer 13

Submental lymph nodes and small vv forming AJV

Question 14

Popliteal fossa boundaries

Answer 14

SL: biceps femoris
SM: semimembranosus & semitendinosus
IL/IM: 2 heads of gastrocnemius
Floor: popliteal surface of femur, joint capsule of knee
Roof: skin, superficial fascia, deep/popliteal fascia

Question 15

Popliteal fossa contents

Answer 15

Popliteal a and v, tibial n, common fib n

Question 16

Femoral triangle boundaries

Answer 16

Inguinal lig, add longus and sartorius

Question 17

Femoral triangle contents

Answer 17

Med to lat NAVEL: nerve (femoral), artery (femoral), vein, empty space, lymph node