Systemic Anatomy Practice Questions

Q: Where is the opening of the Eustachian tube located in the middle ear?

Anterior wall of the middle ear. ***Anterior wall of the middle ear*** - The opening of the **Eustachian tube** (also known as the **auditory tube** or **pharyngotympanic tube**) is located on the **anterior wall** of the middle ear cavity [1]. - This anatomical position allows it to connect the middle ear to the nasopharynx, facilitating **pressure equalization** and **mucous drainage** [1]. *Medial wall of the middle ear* - The **medial wall** of the middle ear contains structures such as the **oval and round windows**, which are critical for sound transmission to the inner ear. - It does not house the opening of the Eustachian tube. *Lateral wall of the middle ear* - The **lateral wall** of the middle ear is primarily formed by the **tympanic membrane** (eardrum) [1]. - This wall is involved in receiving sound waves and converting them into mechanical vibrations, not for Eustachian tube opening. *Posterior wall of the middle ear* - The **posterior wall** of the middle ear contains the **aditus to the mastoid antrum** and the **pyramidal eminence**. - It leads to the mastoid air cells and does not contain the Eustachian tube opening.

Q: Pyriform sinus is laterally bounded by which structure?

Thyroid cartilage. Thyroid cartilage - The pyriform sinus (or pyriform fossa) is a pear-shaped recess located on either side of the laryngeal inlet. - Laterally, it is bounded by the thyroid cartilage and the thyrohyoid membrane, which together form its outer wall. - The thyroid cartilage is the primary and most prominent structure forming the lateral boundary, making it the most accurate answer. Thyrohyoid membrane - The thyrohyoid membrane connects the hyoid bone to the thyroid cartilage and forms part of the lateral wall of the pyriform sinus along with the thyroid cartilage. - While anatomically contributing to the lateral boundary, the thyroid cartilage is typically cited as the primary lateral boundary structure in anatomical texts. Interarytenoid area - This area is located posteriorly between the arytenoid cartilages, forming part of the posterior wall of the pharynx. - It does not form the lateral boundary of the pyriform sinus. Epiglottis - The epiglottis is a leaf-shaped cartilage located anterior to the laryngeal inlet. - It forms the medial boundary anteriorly (via the aryepiglottic fold) but not the lateral boundary of the pyriform sinus.

Q: Rotter's node is

Interpectoral nodes. ***Interpectoral nodes*** - Rotter's nodes are **lymph nodes** located in the **interpectoral** (between the pectoralis major and minor muscles) region and are considered part of the axillary lymph node dissection [1]. - They are **important in breast cancer staging**, as involvement indicates a higher disease burden and can influence treatment decisions [1]. *Internal mammary LN* - These nodes are located along the **internal mammary artery and vein**, situated deep to the sternum. - While also involved in breast cancer metastasis, they are anatomically distinct from Rotter's nodes, which are found in the axilla. *Supraclavicular LN* - These nodes are located **above the clavicle** and are considered a level III axillary lymph node region or, if heavily involved, can indicate distant metastasis in breast cancer. - Involvement often signifies more advanced disease and has different prognostic implications than interpectoral node involvement. *Infraclavicular LN* - Also known as **deltopectoral nodes**, these nodes are found in the groove between the deltoid and pectoralis major muscles. - They are also part of the axillary lymph node basin but are distinct from the interpectoral nodes located deeper between the two pectoral muscles.

Q: Where is the strongest attachment of the zonule located?

Just anterior to the equator of the lens. ***Just anterior to the equator of the lens*** - The **zonular fibers** that suspend the lens of the eye have their strongest and most numerous attachments to the lens capsule in an annular band located **just anterior to the equator**. - This region is crucial for the transmission of tension from the ciliary body to the lens, facilitating **accommodation**. *Equator* - While the **equator of the lens** is a general landmark for zonular attachment, the strongest and most concentrated attachments are specifically found slightly anterior to it. - The zonules span from the ciliary body to the lens, enveloping the equatorial region, but not exclusively attaching at the precise equator for maximum strength. *Posterior to equator* - Attachments posterior to the equator are generally **weaker** and less numerous compared to the anterior aspect. - These posterior zonules primarily help to maintain the lens's posterior position and shape. *Posterior pole* - The **posterior pole** refers to the central point of the posterior surface of the lens. - Zonular attachments are not concentrated at the poles; they attach primarily at the equatorial region, with the strongest attachment just anterior to the equator.

Q: What is the typical position of the vocal cords in a cadaver at rest?

Neutral position (typical at rest in a cadaver). ***Neutral position (typical at rest in a cadaver)*** - In a cadaver, the muscles controlling vocal cord movement are no longer active, leading to a **flaccid state**. - This flaccid state results in the vocal cords resting in a **paramedian or neutral position**, which is between full abduction and full adduction. *Closed position (as seen during phonation)* - This position requires the active contraction of **adductor muscles** (e.g., lateral cricoarytenoid), which is absent in a cadaver. - Vocal cords are fully adducted during **phonation** to vibrate and produce sound. *Slightly adducted position* - While "neutral" can be considered slightly adducted relative to maximal abduction, this option doesn't fully capture the **passive, flaccid state** of a cadaver. - Active slight adduction is usually a **conscious muscular effort** in a living person. *Widely separated position (as seen during deep inspiration)* - This position, also known as **full abduction**, requires active contraction of the **posterior cricoarytenoid muscles** to open the glottis widely for maximal airflow. - In a cadaver, these muscles are inactive, so the vocal cords cannot maintain this **abducted state**.

Question 1

Where is the opening of the Eustachian tube located in the middle ear?

Accepted Answer

Anterior wall of the middle ear

Answer

Medial wall of the middle ear

Answer

Lateral wall of the middle ear

Answer

Posterior wall of the middle ear

Question 2

Which of the following is true regarding the deep inguinal ring:

Accepted Answer

It lies approximately 1.25 cm superior to the mid-point of the inguinal ligament

Answer

It lies medial to inferior epigastric artery

Answer

Opening in the transversus abdominis muscle

Answer

It is traversed by ilioinguinal nerve

Question 3

Pyriform sinus is laterally bounded by which structure?

Accepted Answer

Thyroid cartilage

Answer

Epiglottis

Answer

Thyrohyoid membrane

Answer

Interarytenoid area

Question 4

Rotter's node is

Accepted Answer

Interpectoral nodes

Answer

Internal mammary LN

Answer

Supraclavicular LN

Answer

Infraclavicular LN

Question 5

Where is the strongest attachment of the zonule located?

Accepted Answer

Just anterior to the equator of the lens

Answer

Equator

Answer

Posterior to equator

Answer

Posterior pole

Question 6

What is the typical position of the vocal cords in a cadaver at rest?

Accepted Answer

Neutral position (typical at rest in a cadaver)

Answer

Slightly adducted position

Answer

Widely separated position (as seen during deep inspiration)

Answer

Closed position (as seen during phonation)

Systemic Anatomy — MCQs

Systemic Anatomy — MCQs

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