Anatomy & Physiology of Neck Flashcards
Boundaries of anterior triangle of neck (2)
Anterior - midline of neck
Posterior - anterior border of SCM
Contents of anterior triangle of neck
- salivary gland (1)
- arteries (3)
- veins (2)
- nerves (3)
- lymph nodes (3)
Salivary gland - submandibular (FILLS MOST OF ANTERIOR TRIANGLE)
Arteries - CCA, ECA, facial
Veins - IJV, facial
Nerves - CN X - XII
Lymph nodes - deep cervical, submental, submandibular
Boundaries of posterior triangle of neck (2)
Anterior - posterior border of SCM
Posterior - anterior border of trapezius
Contents of posterior triangle of neck
- arteries (3)
- veins (3)
- nerves (2)
- lymph nodes (1)
Arteries - occipital, subclavian, suprascapular
Veins - EJV, subclavian, suprascapular
Nerves - accessory, cervical plexus
Lymph nodes - supraclavicular
Terminal branches of ECA
Maxillary and superficial temporal arteries
2 fascia layers of the neck
Superficial cervical fascia - between skin and deep cervical fascia
Deep cervical fascia
4 component layers of deep cervical fascia + what they each compartmentalise
Investing layer of fascia - most superficial
Pre-tracheal fascia (cover visceral compartment)
Pre-vertebral fascia (covers vertebral column and muscles around it)
Carotid sheath (covers neurovascular compartment)
Thyroid gland structure
2 lobes joined by isthmus
Function of calcitonin produced by thyroid gland
Lowers serum calcium and raises phosphate
Blood supply of thyroid gland
Superior and inferior thyroid artery
What veins in the neck area are used for central lines
IJV
Subclavian
Where do lymph nodes in the head and neck ultimately drain into
Cisterna chyli (L1) –> drains into thoracic duct
How many groups of lymph nodes are there in the neck + name them (think clinical examination)
10: Supraclavicular Superficial cervical - anterior/posterior cervical chain Parotid Submandibular Submental Pre-auricular Post-auricular/ mastoid Occipital Facial
Deep cervical
How many levels are lymph nodes are divided into
*in surgery, referred to as lymph node levels; not their group
Level I
Level II - IV
Level V
Level VI
What group of lymph nodes in the neck receives all the lymph in the head and neck
Deep cervical lymph nodes - either lymph directly drains into them or lymph from superficial lymph nodes drain into them
Where does lymph from deep cervical lymph nodes ultimately drain into
Thoracic duct
What 3 things could lymphadenopathy be due to
Infection
Inflammation
Malignancy
What is a thyroglossal cyst
Dilation of thyroglossal duct remnant in the midline of the neck
What was the purpose of the thyroglossal duct
Thyroid gland arised from it embryologically
Physical diagnosis of thyroglossal cyst
Cyst moves up when you stick tongue out because thyroglossal duct opens up in posterior tongue
Treatment of thyroglossal cyst
Surgical excision of cyst + thyroglossal duct
Investigations for a thyroid mass (3)
FNAC
USS
Thyroid lobectomy
4 types of thyroid cancer
Papillary - spreads lymphatic ally
Follicular - blood spread
Medullary
Anaplastic
What can’t FNAC distinguish in a thyroid mass
If it’s a follicular adenoma or carcinoma
What is colloid goitre due to
Thyroid gland hyperplasia
What is grave’s disease + who does it affect more
Autoimmune disease of thyroid gland
Females
Pathophysiology of grave’s disease
Autoantibodies act against thyroid stimulating hormone receptor, causing it to become OVER-ACTIVE –> HYPERTHYROIDISM
Grave’s disease is the NO.1 cause of what
Hyperthyroidism
Complications of Graves’ disease (2)
Thyroid eye disease
Pre-tibial myxoedema (graves’ dermopathy) - red swollen skin on shins and feet
Treatment of Graves’ disease (4)
Anti-thyroids
Beta blockers
Radio-iodine
Surgery - thyroidectomy
Indications for thyroidectomy (3)
Airway obstruction
Malignancy
Thyrotoxicosis
A thyroid mass can be classified into what 3 groups
Solitary nodule
Diffuse enlargement
Multi-nodular goitre
What is a multi-nodular goitre
Lump containing many thyroid nodules
What is a toxic goitre
multi-nodular thyroid gland swelling that contains thyroid nodules which function independent of thyroid stimulating hormone, i.e. produces thyroid hormone whenever it wants without having to be stimulated by TSH –> hyperthyroidism
Do you get bulging eyes in people with a toxic goitre
No
Investigations for toxic goitre (3)
Thyroid function tests - TSH, T3/4
FNAC
CXR
What lymph nodes make up the level I neck lymph nodes (2)
submental, submandibular
What lymph nodes make up the level II-IV neck lymph nodes
Deep cervical chain (deep to SCM)
What lymph nodes make up the level V neck lymph nodes
Lymph nodes in posterior triangle of neck, e.g. supraclavicular
What lymph nodes make up the level VI neck lymph nodes
Lymph nodes in anterior midline of neck, e.g. pre-tracheal