Isthmus lies in front 2nd to 4th tracheal rings
Pyramid lobe is usually to left of median plane
Parathyroid glands
Parathyroid glands & thyroid gland
Thyroid –arteries
esophagus, external & recurrent laryngeal nerves ❖ Posteriorly: parathyroid gland
Thyroid ---capsules
false thyroid capsule True capsule
Thyroid –external feature
Thyroid –arteries
❖ Inferior thyroid artery : branch of the thyrocervical trunk, posterior to the carotid sheath to reach the posterior aspect of the gland.
Thyroid gland & Root of neck
Thyroid gland
Outline 1. Location & superficial feature 2. Blood supply 3. Venous drainage 4. nerves 5. Relationship of its vessels and arteries
Thyroid Ima Artery
Superior, middle, & inferior thyroid v.
❖ Veins of thyroid gland connect to form a plexus between its two s & finally are drained by three pairs of veins.
right & left lobes isthmus pyramidal lobe
Thyroid –external feature
Upper pole of its lobe extends upward to oblique line of thyroid cartilage
Lower one downward to level of 6th tracheal ring
Root of the neck
The area between the thorax and neck. It opens into the superior thoracic aperture. The jugular notch opposite posteriorly to disc between the T1 & T2
T2 vertebrae
What structures in the root of the neck
All structures going ❖ from the head to the thorax; ❖ from the thorax to the upper limb; ❖ from the neck to upper limb and through the superior thoracic aperture.
❖ There are two pairs of arteries supplying thyroid gland.
❖ Superior thyroid a. arises from ECA & reaches gland at its upper pole. On its way to gland, STA runs accompanied with external laryngeal nerve.
Logo
Skeleton of root of neck
❖ laterally by the first pair of ribs and their costal cartilages
❖ Anteriorly by manubrium ❖ Posteriorly by the body of T1 &
❖ ITA divides into several branches that pierce the false capsule, supply the inferior pole of the gland
❖ Before arrived to gland it runs across recurrent laryngeal nerve.
Location & relationship
Important Relationship of Thyroid Gland
Anteriorlly: infrahyoid muscles & SCM ❖ Posterolaterally: carotid sheath & its
contents ❖ Medially: larynx, trachea, pharynx
Structures in the root of the neck
viscera organs of digestive system and respiratory system: the trachea and esophagus are located in anterior median line . carotid sheath and structures located in this sheath . Brachial plexus and subclavian vessels phrenic nerve structures in triangle of the vertebral artery: vertebral a, thyrocervical trunk Sympathetic trunk of neck apex of lungs, cervical pleura and sibson fascia
❖ Superior & middle thyroid veins empty into IJV
❖ but inferior one into brachiocephalic vein.
Superior, middle, & inferior thyroid v.
Nerves & arteries