ANATOMY Flashcards
The thyroid gland is invested by what structure?
a. Carotid sheath
b. Pretracheal fascia
c. Prevertebral fascia
d. Superficial layer of deep fascia
B. Pretracheal fascia
Superficial cervical fascia
(platysma)
Deep cervical fascia 1. Investing layer/ Superficial deep fascia (SCM, Trapezius) 2. Pretracheal (thryoid gland) 3. Carotid sheath 4. Prevertebral (cervical vertebra)
Cranial nerve that descends through the neck in the Carotid sheath?
a. hypoglossal
b. vagus
c. accessory
d. glossopharyngeal
B. vagus
Enumerate: boundaries of Carotid sheath
LATERAL =
MEDIAL =
POSTERIOR =
Lateral = internal jugular vein Medial = common & internal carotid a. Posterior = vagus n.
Ludwig’s angina primarily involves which fascial planes?
a. visceral space
b. submandibular space
c. retropharyngeal space
d. masticatory space
e. carotid sheath
C. submandibular space
Ludwig’s angina
severe cellulitis involving floor of mouth
odontogenic
primarily from submandibular space
TRUE of mylohoid muscle, EXCEPT:
a. forms the floor of mouth
b. part of suprahyoid muscle
c. separates the submandibular & sublingual spaces
d. separates the submaxillary & submandibular space
EXCEPT D.
Mylohyoid
- forms the floor of mouth
- part of suprahyoid muscle
- separates the submandibular & sublingual spaces
The hyoid bone liest at what level of cervical vertebra?
a. 2
b. 3
c. 4
d. 5
B. C3
NECK. The only bone that does not articulate with another bone?
Hyoid bone
- serves as a moveable base for tongue
- at the level of C-3 vertebra
The ff muscles ELEVATE the hyoid bone, EXCEPT:
a. digastric
b. mylohyoid
c. sternothyroid
d. stylohyoid
e. geniohyoid
EXCEPT C. sternothyroid
Suprahyoid m. (elevates Hyoid)
- digastric
- mylohyoid
- stylohyoid
- geniohyoid
Infrahyoid m. (depresses Hyoid)
- omohyoid (superficial)
- sternohyoid (superficial)
- thyrohyoid (deep)
*SternoThyroid (deep)- depresses the LARYNX
“Ansa cervicalis” is the nerve supply of ALL the Hyoid depressors, EXCEPT:
a. omohyoid
b. sternohyoid
c. sternothyroid
d. thyrohyoid
EXCEPT D. thyrohyoid (innervated by C1)
- root of Ansa cervicalis
- C1, C2, C3
“Triangle of the neck” that is bounded by:
post. belly of diagstric
sup. belly of omohyoid
ant. border of SCM
a. muscular
b. digastric
c. carotid
d. submental
C. carotid triangle
Muscle that divided the neck into 2 triangles (post & ant)?
Sternocleidomastoid (SCM)
The ONLY unpaired “triangle of the neck”?
Submental triangle
boundaries:
- ant. belly of digastric
- hyoid bone
- mylohyoid (floor)
Muscle that separates the submandibular and sublingual space?
a. geniohyoid
b. digastric, post. belly
c. digastric, ant. belly
d. mylohyoid
D. mylohyoid
- floor of Submental & Digastric
The contents of the upper portion of the carotid sheath are crossed obliquely and anteriorly by?
a. omohyoid
b. digastric, ant. belly
c. digastric, post. belly
d. mylohyoid
C. digastric, post. belly
The carotid pulse is easily palpated on:
a. post. border of SCM
b. level of the inferior border of thyroid cartilage
c. level of the superior border of thyroid cartilage
d. level of the inferior border of hyoid bone
C. SUPERIOR border of thyroid cartilage
-just beneath the anterior border of SCM
NECK. What are the boundaries of the Muscular triangle?
3
Muscular triangle/ Strap muscles
- sup. belly of Omohyoid
- ant. midline of Neck
- ant. borders of SCM
What divides the occipital and supraclavicular triangle?
a. inf. belly of omohyoid
b. sup. belly of omohyoid
c. post. digastric
d. ant. digastric
A. inferior belly of omohyoid
Cranial nerve that crosses the Occipital triangle:
a. CN 9
b. CN 10
c. CN 11
d. CN 12
C. accessory nerve (CN 11)
Accessory nerve lesions
- “drooping of shoulder” (diff. shrugging the shoulder)
- trapezius m. weakness
- diff. elevating the scapula
- diff. in lateral rotation of scapula during arm abduction
“Neck triangle” that is crossed by external jugular vein & subclavian artery?
SupraClavicular triangle
-AKA “subclavian triangle”, “omoclavicular”, “Suboccipital”
Structure that connects the right and left lobes of the thyroid gland?
ISTHMUS
-at the level of 2,3,4 tracheal rings
Ave. normal weight of thyroid gland?
20 gms (GRAMS)