Table 1 Anatomical structures of the black jacobin syringes described in this study

lateral labium

LL

labium laterale

[36]

Paired soft tissue. Projects from between the caudal tympanum and half-ring B1 into the syrinx air passage.

Figure 4a

medial labium

ML

labium mediale

[36]

Paired soft tissue. Projects from the medial part of the syrinx into the air passage.

Forms a tissue continuum with the medial tympaniform membrane.

Figure 4a

medial tympaniform membrane

MTM

membrana tympaniformis medialis

[36]

Paired connective tissue element. Suspended between the ventro-dorsal extremities of the bronchial half-rings B1 and B3.

Forms a tissue continuum with the medial labium.

Figure 4a

tracheolateral muscle

TL

musculus tracheolateralis

[36]

Paired muscle. Forms an extended band along the trachea. Attaches caudally to the syrinx and cranially to the larynx.

Figure 3e-g

cranial syringeal muscle

CrS

musculus syringealis cranialis

present study

Paired muscle. Attaches to tympanum and the cranial part of the half-ring B2.

Figure 3

lateral syringeal muscle

CeS

musculus syringealis centralis

present study

Paired muscle. Attaches to tympanum and the central part of the half-ring B2.

Figure 3

caudal syringeal muscle

CaS

musculus syringealis caudalis

present study

Paired muscle. Attaches to tympanum and the lateral part of the half-ring B1.

Figure 3